Chemical Compositions(%) of JIS G3429

Tolerances of JIS G3429

Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers’ requirements.

Painting: as requested.

The tubes shall be manufactured by seamless process, electric resistance welding process, or butt welding process, and those of other grades shall be manufactured by seamless process or electric resistance welding process. The tube shall be as manufactured or as cold-finished condition, or they shall be subjected to appropriate heat treatment.

The tubes shall be practically straight. and the two ends shall be at right angles to the axis of the tube.

The tubes shall be free from defects detrimental to practical use.

This should be marked out in the contract after negotiated by the two parties. The amount of steel tubes shorter than 4000 mm should not exceed five percent of your total number of delivered seamless steel pipe for gas cylinder. The two end surface should be perpendicular to the steel pipe axis. The cutting burrs should be took off.

Standards JIS G3429 standard is typically applicable for gas cylinder steel tubing. We can manufacture the following grade of seamless steel pipe for gas cylinder: 37Mn, 34Mn2V, 30CrMo, 35CrMo, STH11, STH12, STH21, STH22, or anything else.

Manufacturing TechnologyWe adopt hot rolling (hot expanding) or cold rolling (cold drawing) to produce gas cylinder steel replacements.
ApplicationsThis steel tube is mainly appeared to make different associated with gas cylinders, hydraulic cylinders and other high pressure cylinders. Seamless steel pipe for gas cylinder can also be applicable for Gas main Vehicle (NGV) cylinders, Compressed Natural Gas (CNG) trailers, transportation and storage of compressed hydrogen, as well as technical gases, and also scuba diving and fire extinguisher.

Tolerances of JIS G3429

Advantages

• JST seamless steel pipe for gas cylinder has good surface quality. There does not visible crack, wrinkling, abscission layer and rolling skin (scarring).
• Inside of production process, there always exist some surface quality defects, regarding flaw, scar, laceration, rolling burr other people. We possess UNICORN ultrasonic joint inspection machine, automatic ultrasonic testing machine and magnetic flux leakage testing host. They are used for detecting obvious surface defects of gas cylinder steel tubes.
• Iwowwee also employs professional inspection personnel may detect the unobvious inner and outer surface defects on the seamless steel pipe for gas tank. If find any flaw, they will be sufficient polishing, removal, repair too series of processes in keeping with relevant regulations.
• Delivery StatusHot-rolled steel tubes are delivered in hot-rolled state while cold-rolled steel pipes are delivered in cold-rolled, normalizing or annealing state.

Japanese Industrial Standards for steel

Japanese Industrial Standards (JIS) developed by the organization apply to a wide variety of industrial services and technologies such as automobiles, metallurgy, ships and medical equipment

The method for making cold-drawn seamless pipes involves taking a round “billet” or bar of steel and boring it in the center, turning it, cutting it, heating it to make it more pliable, then “drawing” it (extruding or pulling it) to make it a longer and thinner tube.

Japanese Industrial Standards specifies the standards used for industrial activities in Japan. The standardization process is coordinated by Japanese Industrial Standards Committee and published through Japanese Standards Association.

The Industrial Standardization Law was revised in 2004 and the JIS mark product certification system was changed. Standards are named like “JIS X 0208:1997″, where X denotes area division, followed by four digits (or five digits for some of the standards corresponding ISO standards) and the revision release year.

• G – Ferrous Materials and Metallurgy
• H – Nonferrous Materials and Metallurgy

MTC IN EN 10204.3

EN 10204:2004 is for metallic products-and this norm tell us things about Types of inspection documents. There are no material standards.

Mostly material is defined with its chemical composition and mechanical properties in a public standars like ISO, EN, JIS, ASTM etc.

What is JIS?

Japanese Industrial Standards (JIS) specifies the standards used for industrial activities in Japan. The standardization process is coordinated by Japanese Industrial Standards Committee and published through Japanese Standards Association.

Tolerance of JIS seamless pipe

Table 1: Tolerance on Outside Diameter in JIS G3441, G3444, G3445

Table 2: Tolerance on Wall Thickness in JIS G3441, G3444, G3445

Table 3: Tolerance on Outside Diameter and Wall Thickness in JIS G3454

Table 4: Tolerance on Outside Diameter and Wall Thickness in JIS G3455, G3456, G3458, G3460

Table 5: Tolerance on Outside Diameter in JIS G3461, G3462, G3464

Table 6: Tolerance on Wall Thickness in JIS G3461, G3462, G3464

Table 7: Tolerance on the Length in JIS G3461, G3462, G3464

Table 8: Tolerance on Outside Diameter in JIS G3465

JIS Number and Corrensponding Foreign Standards

In the Meiji era, private enterprises were responsible for making standards. However, the Japanese government did have standards and specification documents for procurement purposes for certain articles, such as munitions. These were summarized to form an official standard old JES in 1921. During World War II, simplified standards were established to increase matériel output. The Industrial Standardization Law was enacted in 1949, which forms the legal foundations for the present Japanese Industrial Standards.

Measurement size & Testing

• JIS seamless pipe testing covers many specifications, including alloy, size, toughness and composition.
• Those using steel products purchase the product that fulfills the requirements they need for what they are building.
• How To Measure Hardness Of Steel Pipe

Packing

• Packed in wooden crates, wrapped in plastic, and suitably protected for sea-worthly delivery or as requested.
• Both ends of each crate will indicate the order no., heat no., dimensions, weight and bundles or as requested.

Delivery

• Pipes are supplied in hexagonal bundles or round bundles tied with steel strip.
• Weight of bundle – up to 5000 kg upon request of customer.
• Each bundle is furnished with three tags.

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Other Range of JIS standards for steel pipes

JIS seamless pipe according to alloy, stainless steel or carbon. It tests steel’s properties, hardness, resistance to corrosion, pitting, heat treating processes and others. The results are listed in a main JIS steel grade for steel pipe as below.

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Process

Cold drawn seamless steel tube deformed process

Cold Drawn Seamless Mechanical Tubing (CDS) is a cold drawn 1018/1026 steel tube which offers uniform tolerances, enhanced machinability and increased strength and tolerances compared to hot-rolled products.

Cold drawn steel tube is with hot-rolled steel coil as raw material, and tandem cold rolling pickled to remove oxide scale, its finished rolling hard roll, rolling hard volumes due to the continuous cold deformation caused by cold hardening strength, hardness increased indicators declined tough plastic, stamping performance will deteriorate, which can only be used for simple deformation of the parts.

Rolling hard roll can be used as the raw material of the hot-dip galvanizing plant, hot dip galvanizing line set annealing line. Rolling hard roll weight is generally 6 to 13.5 tons, the coil diameter of 610mm.

Hot rolled seamless steel pipe deformed process

Hot-rolled seamless steel pipe production base deformation process can be summarized as three stages: perforation, extension and finishing.

The main purpose of the perforation process is to become a solid round billet piercing hollow shell. Capillary in the specifications, accuracy and surface quality can not meet the requirements of the finished product, further improvements are needed to deform the metal through. The main purpose of the stretching machine is further reduced sectional view (main compression wall) for a larger axial extension, so that the capillary improved dimensional accuracy, surface quality and organizational performance.

After stretching machine rolled steel pipe shortage collectively need further molding mill in order to achieve the requirements of the finished pipe. Rolled steel due to pass in the method widely used in the production of seamless steel tubes.

So far, due to the method pass rolling steel can be divided into two categories: core pension without rolling rolling (hollow body rolling), and with the mandrel. Sizing machines, reducing mill and stretch reducing mill belonging to the hole without mandrel type continuous rolling mills are generally coffin. Its main purpose is to reduce the diameter of the deformation process or sizing get finished steel, the wall thickness of process control, can make thinning, thickening or nearly unchanged.

All the traditional hole-type rolling machine with mandrel belong to extend machine. The main purpose is to reduce the deformation process perforated capillary wall thickness and outer diameter roll passes in the deformation zone and the mandrel posed, for a larger axial extension. At the same time a certain improvement in the organization, performance, accuracy, surface quality.

The main manufacturing technology of seamless carbon steel pipe

1.Plug rolling production

The production equipment consists of punching machine, automatic pipe rolling machine, coiling machine, sizing machine and reducing machine. The round tube is inserted into the hollow of the thick-walled tube, and the axes of the two rollers form an oblique angle with the rolling line. In recent years, the inclination angle has increased from 6° to 12° to 13° to 17°, increasing the speed of the punch. When producing structural seamless pipe with a diameter greater than 250mm, secondary perforation is used to reduce the thickness of the hollow billet wall. New technologies have also been developed to enhance the perforation process and improve the quality of the capillary.

2. Continuous rolling production

The production equipment includes punching machine, continuous rolling mill, and tension reduction machine. The round billet is pierced into a hollow billet, then inserted into the mandrel, and continuously rolled by 7 to 9 two-roll mills. After rolling, the mandrel bar is taken out and reheated to reduce tension. In 2014, the annual output of 140mm continuous rolling mills is 0.4 to 600,000 tons, which is 2 to 4 times that of plug mills. The characteristics of this unit are suitable for the production of steel pipes with a diameter of 168mm or less. However, the equipment investment is large, the installed capacity is large, and the processing and manufacturing are complex.

3. Three-roll rolling production

Three-roll rolling production is mainly used to produce thick-walled seamless steel pipes with high dimensional accuracy. The wall thickness accuracy of the seamless steel pipe produced by this manufacturing process can reach plus or minus 5%, and the pipe accuracy is twice that of the seamless steel pipe produced by other methods. This manufacturing technique developed rapidly with the invention of the new three-high skew rolling mill in the 1960s. The new type of rolling mill is characterized by rapidly rotating the inlet rotary rack to change the expansion angle of the tail, thereby preventing the triangle from appearing at the tail, and expanding the ratio of the outer diameter to the wall thickness of the production varieties from 12 to 35, which can not only produce thin-walled seamless welded steel pipes , but also can improve production capacity.

4. Extrusion tube production

The peeled round base is first perforated or expanded, then heated by induction heating or a salt bath, coated with lubricant, and loaded into the extruder. The metal is squeezed into the pipe through the circular gap between the mandrel and the tip of the pen. This manufacturing process is mainly used for the production of superalloy tubes, specialty tubes, composite tubes and non-ferrous metal tubes. It has a wide range of production but low volumes. The production of extruded tubes has also grown in recent years due to improvements in die materials, lubricants and extrusion speeds.

5. Cold rolling (cold drawing) production

This manufacturing process is used to produce small-diameter precision-shaped thin-walled low-carbon steel pipes. It is characterized by the use of multi-stage cycle manufacturing technology. In the 1960s, it began to develop in the direction of high speed, multi-line, long stroke and long tube blank. In addition, small roller mills have also been developed, mainly for the production of precision tubes with a thickness of less than 1mm. The cold rolling equipment is complex, the tool processing is difficult, and the specification conversion is not flexible. And usually a combined process of cold rolling and cold drawing is used, that is, cold rolling is used to reduce the wall thickness to obtain larger deformation, and cold drawing technology is used to obtain various specifications.

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There are many kinds of materials used for transport in industrial production. Specifically we will have more choices and it is not limited to the use of alloy steel pipe. But even in the face of more choices, many people tend to choose alloy steel pipe. People make their own choices will have their own reasons. This means the alloy steel pipe application has its own advantages. Compared with transmission lines made of other materials, after it meets the basic application requirements, its quantity is lighter. Then in the practical application of alloy steel pipe, it will have more advantages because of this. Besides its physical characteristic advantage, it also has economic advantages. The wide application of alloy steel pipe is with kinds of reasons. So in practical usage, we can exploit the advantages to the full, in this way can we get more profits in these applications of alloy steel pipe.

What requirements should alloy steel pipe application meet

The transportation of kinds of gases or liquids in production needs to rely on alloy steel pipe. This shows that the actual role of alloy steel pipe application is important. High temperature resistant and low temperature resistant is the tolerance of temperature. In the practical application of alloy steel pipe, there will be many materials need to be transported. However their temperatures are not the same. So this can be the basic requirement to alloy steel pipe. It needs more corrosion resistance. Corrosion resistant material is the best material during transporting, because it is corrosion resistant. So it can be used in more occasions. And it is definitely very convenient for users.

The biggest advantages of alloy steel pipe

Can be 100% recycled, environmentally friendly, energy-saving, resource conservation, national strategy, national policy to encourage the expansion of the field of application of high-pressure alloy pipe. Of alloy steel pipe total consumption accounted steel in the proportion is only half of the developed countries, to expand the field of use of the alloy steel pipe to provide a wider space for the development of the industry. The future needs of the average annual growth of China’s high-pressure alloy steel pipe long products up to 10-12%.

Specification, standard and identification of alloy steel pipes

Alloy Steel pipe contains substantial quantities of elements other than carbon such as nickel, chromium, silicon, manganese, tungsten, molybdenum, vanadium and limited amounts of other commonly accepted elements such as manganese, sulfur, silicon, and phosphorous.

Industries We Serve

Our team of experienced sales specialists proudly partners with gas and chemical processors, power generation plants, oil refineries, and related industries to offer piping components and value-added services.

The biggest advantages of alloy steel pipe can be 100% recycled, environmentally friendly, energy-saving, resource conservation, national strategy, national policy to encourage the expansion of the field of application of high-pressure alloy pipe. Of alloy tube total consumption accounted steel in the proportion is only half of the developed countries, to expand the field of use of the alloy tube to provide a wider space for the development of the industry. According to the Chinese Special Steel Association alloy pipe Branch Expert Group, the future needs of the average annual growth of China’s high-pressure alloy pipe long products up to 10-12%.

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Inspection

Chemical composition inspection, mechanical properties test(tensile strength,yield strength, elongation, flaring, flattening, bending, hardness, impact test), surface and dimension test,no-destructive test, hydrostatic test.

PMI

identification of the chemical composition of the metal used to manufacture the fitting. Uses PMI sensors, including X-ray fluorescence or optical emission spectrometry.

Size measurement

Seamless pipes with compound bevels as per ASME B16-25 And ASTM A333

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Delivery

Steel pipe delivery status(condition)

Steel pipe delivery status(condition): cold / hard (BK), cold / soft (BKW), after cold stress relief annealing (BKS), annealing (GBK), normalized (NBK).

Condition on delivery of steel pipe

The general cold strip mills, volume should go through continuous annealing (CAPL unit) to eliminate cold hardening and rolling stress, or batch annealing reach the mechanical properties of the corresponding standard specifies. Cold rolled steel surface quality, appearance, dimensional accuracy better than hot-rolled plate, and right-rolled thin product thickness is about 0.18mm, so the majority of users favor.

Cold rolled steel coil substrate products deep processing of high value-added products. Such as electro-galvanized, hot dip galvanized, electro-galvanized fingerprint resistant, painted steel roll damping composite steel, PVC laminating steel plates, etc., so that the excellent quality of these products has a beautiful, high resistance to corrosion, has been widely used.

Cold rolled steel coil finishing after annealing, cut the head, tail, trimming, flattening, smooth, heavy volume, or longitudinal clipboard. Cold-rolled products are widely used in automobile manufacturing, household electrical appliances, instruments, switches, buildings, office furniture and other industries. Steel plate strapping package weight of 3 to 5 tons. Flat sub-volume typically 3 to 10 tons / volume. Coil diameter 6m.

Packing

Bare packing/bundle packing/crate packing/wooden protection at the both sides of tubes and suitably protected for sea-worthly delivery or as requested.

There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method to work prevent rusting and Sea transportation security.

• Plastic caps plugged at the two sides of pipe ends
• Should be avoided by the steel strapping and transport damage
• Bundled signs should be uniform and consistent
• The same bundle(batch) of steel pipe should be came from the same furnace.
• The steel pipe has the same furnace number, the same steel grade, the same specifications.

Our packing can meet any needs of the customers.

Placing steel pipes into containers

Q&A

Our team of experienced sales specialists proudly partners with gas and chemical processors, power generation plants, oil refineries, and related industries to offer piping components and value-added services.

The most important and desired changes in alloy steel are

Alloy steels are made by combining carbon steel with one or several alloying elements, such as manganese, silicon, nickel, titanium, copper, chromium and aluminum. These metals are added to produce specific properties that are not found in regular carbon steel. The elements are added in varying proportions (or combinations) making the material take on different aspects such as increased hardness, increased corrosion resistance, increased strength, improved formability (ductility); the weldability can also change.

• Increased hardenability.
• Increased corrosion resistance.
• Retention of hardness and strength.
• Nearly all alloy steels require heat treatment in order to bring out their best properties.

Alloying Elements & Their Effects

• Chromium – Adds hardness. Increased toughness and wear resistance.
• Cobalt – Used in making cutting tools; improved Hot Hardness (or Red Hardness).
• Manganese – Increases surface hardness. Improves resistance to strain, hammering & shocks.
• Molybdenum – Increases strength. Improves resistance to shock and heat.
• Nickel – Increases strength & toughness. Improves corrosion resistance.
• Tungsten – Adds hardness and improves grain structure. Provides improved heat resistance.
• Vanadium – Increases strength, toughness and shock resistance. Improved corrosion resistance.
• Chromium-Vanadium – Greatly improved tensile strength. It is hard but easy to bend and cut.

Pipes, Tubes and Hollow Sections

Norms

• API 5L – Line Pipe
• ASTM A 53 – Black and Hot-Dipped, Zinc-Coated, Welded and Seamless, Steel Pipe
• ASTM A 106 – Seamless Carbon Steel Pipe for High-Temperature Service
• ASTM A 213 – Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
• ASTM A 269 – Seamless and Welded Austenitic Stainless Steel Tubing for General Service
• ASTM A 312 – Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
• ASTM A 333 – Seamless and Welded Steel Pipe for Low-Temperature Service
• ASTM A 335 – Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
• ASTM A 358 – Electric-Fusion-Welded Austenitic Chromium-Nickel Stainless Steel Pipe for High-Temperature Service and General Applications
• ASTM A 671 – Electric-Fusion-Welded Steel Pipe for Atmospheric and Lower Temperatures
• ASTM A 672 – Electric-Fusion-Welded Steel Pipe for High-Pressure Service at Moderate Temperatures
• ASTM A 790 – Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe
• ASTM A 928 – Ferritic/Austenitic (Duplex) Stainless Steel Pipe Electric Fusion Welded with Addition of Filler Metal
• EN 10208-2 – Steel pipes for pipelines for combustible fluids – Part 2: Pipes of requirement class B
• EN 10210-1/2 – Hot finished structural hollow sections of non-alloy and fine grain steels
• EN 10216-1 – Seamless steel tubes for pressure purposes – Part 1: Non-alloy steel tubes with specified room temperature properties
• EN 10216-2 – Seamless steel tubes for pressure purposes – Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties
• EN 10217-1 – Welded steel tubes for pressure purposes – Part 1: Non-alloy steel tubes with specified room temperature properties
• EN 10217-2 – Welded steel tubes for pressure purposes – Part 2: Electric welded non-alloy and alloy steel tubes with specified elevated temperature properties
• EN 10219-1/2 – Cold formed welded structural hollow sections of non-alloy and fine grain steels
• EN 10297-1 – Seamless circular steel tubes for mechanical and general engineering purposes – Part 1 Non-alloy and alloy steel tubes

Grade

• API 5L Gr. A, B, X42, X52, X60, X65, X70
• ASTM A 53 Gr. A, Gr. B
• ASTM A106 Gr. A, B, C
• ASTM A 213 TP 304, 304L, 304H, 316, 316L, 316H, 321, 321H, T5, T9, T11
• ASTM A 269 TP 304, 304L, 304H, 316, 316L, 316H, 321, 321H
• ASTM A 312 TP 304, 304L, 304H, 316, 316L, 316H, 321, 321H
• ASTM A 333 Gr. 3, Gr. 6 ASTM A 335 P1, P2, P5, P9, P11, P12, P22, P91, P92
• ASTM A 358 TP 304, 304L, 304H, 316, 316L, 316H, 321, 321H
• ASTM A 671 CC 60, CC 65, CC 70
• ASTM A 672 CC 60, CC 65, CC 70
• ASTM 790 UNS S31803, UNS S32205, UNS S32750, UNS S32760
• ASTM A928
• EN 10208-2 L245, L 290, L360
• EN 10210-1 S235 JRH, S275 JOH, S275 J2H, S355 JOH, S355 J2H
• EN 10216-1 P235 TR1/2
• EN 10216-2 P235 GH, P265 GH
• EN 10217-1 P235 TR1/2, P275 TR1/2
• EN 10217-2 P235 GH, P265 GH
• EN 10219-1 S235 JRH, S275 JOH, S275 J2H, S355 JOH, S355 J2H
• EN 10297-1 E235, E275, E315, E355, E470