JIS seamless pipes refer to steel pipes that adhere to the standards set by the Japanese Industrial Standards (JIS).
JIS seamless pipes are steel pipe that have been created by JIS and meets certain performance requirements. JIS standards cover various types of seamless pipes, including alloy steel, stainless steel, and carbon steel. These standards specify the technical requirements, dimensions, materials, and testing methods for seamless pipes. Some commonly referenced JIS standards for seamless pipes include JIS G3455, JIS G3452, JIS G3429, JIS G3441, JIS G3444, JIS G3445, and JIS G3454.
JIS seamless pipes are available from manufacturers and suppliers worldwide. They come in different sizes, grades, and specifications to meet specific project requirements. It is important to consult with suppliers or refer to official sources to ensure the correct JIS standard is selected for a particular application.
When shopping for JIS seamless pipes it is important to consider the following factors:
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.
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.
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.
Table 1: Tolerance on Outside Diameter in JIS G3441, G3444, G3445
Standard | Tolerance on outside diameter (mm) | |
JIS G3441 JIS G3444 JIS G3445 |
=50 | ±0.5 |
>50 | ±1% | |
JIS G3441 JIS G3444 JIS G3445 |
<50 | ±0.25 |
>50 | ±0.5% | |
JIS G3441 JIS G3445 |
<25 | ±0.12 |
>25-40 | ±0.15 | |
>40-50 | ±0.18 | |
>5:.60 | ±0.20 | |
>60-70 | ±0.23 | |
>70-80 | ±0.25 | |
>80-90 | ±0.30 | |
>90-100 | ±0.40 | |
>100 | ±0.5% | |
JIS G3441 | <13 | ±0.25 |
>13-25 | ±0.40 | |
>25-40 | ±0.60 | |
>40-65 | ±0.80 | |
>65-90 | ±1.00 | |
>90-140 | ±1.20 | |
>140 | By agreement |
Standard | Tolerance on wall thickness (mm) | |
JIS G3441 JIS G3444 JIS G3445 |
<=4 | -0.5,+0.6 |
>4 | -12.5%, +15% | |
JIS G3441 JIS G3444 JIS G3445 |
<=3 | ±0 .3 |
>3 | ±10% | |
JIS G3441 JIS G3445 |
<=2 | ±0.15 |
>2 | ±8% |
Process | Tolerance on outside diameter | Tolerance on wall thickness | ||
<40A | ±0.5mm | <=4mm | +0.6mm -0.5% |
|
>50A, <125A | ±1% | |||
Hot Rolled Seamless Pipes |
150A | ±1.6mm | >4mm | +15% -12.5% |
>200A | ±0.8% | |||
More than 350mm,the Tolerance is ±0.5% |
||||
Cold Drawn Seamless Pipes and Electric Resistant Welded Pipes |
<25A | ±0.3mm | <=3mm | ±0.3mm |
>32A | ±0.8% | >3mm | ±10% | |
But more than 350mm, the Tolerance is ±0.5% |
Process | Tolerance on outside diameter | Tolerance on wall thickness | ||
Hot Rolled Seamless Pipes |
<=50mm | ±0.5mm | <=4mm | ±0.5mm |
>50-160mm | ±1% | |||
>160-200mm | ±1.6mm | >4mm | ±12.5% | |
>200mm | ±0.8% | |||
More that 350mm, the Tolerance is ±0.5% |
||||
Cold Drawn Seamless Pipes and Electric Resistant Welded Pipes |
<=40mm | ±0.3mm | <=2mm | ±0.2mm |
>40mm | ±0.8% | >2mm | ±10% | |
More than 350 mm the Tolerance is ±0.5% |
O.D. | Tolerance on outside diameter | ||||
Hot rolled seamless pipes | Seamless pipes through quench and normalized | Cold drawn seamless pipes throng, the hot treatment except quench and normalized | Electric welded pipes except cold drawn | Cold drawn electric welded pipes | |
mm | |||||
---|---|---|---|---|---|
<=25 | +0.4 -0.8 |
±0.25 | ±0.10 | ±0.15 | ±0.10 |
>25.40 | ±0.25 | ±0.15 | ±0.20 | ±0.15 | |
>40-50 | ±0.25 | ±0.20 | ±0.25 | ±0.20 | |
>50.60 | ±0.25 | ±0.25 | ±0.30 | ±0.25 | |
>60-80 | ±0.30 | ±0.30 | ±0.40 | ±0.30 | |
>80.100 | ±0.40 | ±0.40 | -0.60,+0.40 | ±0.40 | |
>100-120 | +0.4 -1.2 |
-0.60,+0.40 | -0.60,+0.40 | -0.80,+0.40 | -0.60,+0.40 |
>120-160 | -0.80,+0.40 | -0.80,+0.40 | -1.00,+0.40 | -0.80,+0.40 | |
>160-200 | -1.8,+0.4 | -1.20,+0.40 | -1.20,+0.40 | -1.20,+0.40 | -1.20,+0.40 |
>200 | -2.4,+0.4 | -1.60,+0.40 | -1.60,+0.40 | -1.60,+0.40 | -1.60,+0.40 |
Wall thickness (mm) |
Hot rolled seamless pipe | Cold drawn seamless pipe | Electric welded pipe | |||
O.D(mm) | O.D(mm) | O.D(mm) | ||||
<=100 | >100 | <=40 | >40 | <=40 | >40 | |
(%) | ||||||
---|---|---|---|---|---|---|
<=2 | – | – | -0,+0.4mm | +22 -0 |
-0,+0.3mm | +18 0 |
>2-2.4 | -0,+40 | – | +20 -,0 |
+18 -0 |
||
>2.4-3.8 | -0,+35 | -0,+35 | ||||
>3.8-4.6 | -0,+23 | -0,+33 | ||||
>4.6 | -0,+28 | -0,+28 |
Item | Tolerance an length | |
OD<50mm | <7m | -0, +7mm |
>=7m | Every 3m increase in length, the plus tolerance be increased by 3mm with a maximum of 15mm | |
OD>=50mm | <7m | -0, +10mm |
>=7m | Every 3m increase in length, the plus tolerance be increased by 3mm with a maximum of 15mm | |
OD: Outside Diameter |
Process | Tolerance on outside diameter (mm) | |
Hot Rolled | <=50 | ±0.5 |
>50 | ±1% | |
Cold Drawn | <=40 | ±0.2 |
>40 | ±0.5% |
JIS | ASTM | BS | DIN | NF | ISO | Index Number | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Standard Number | Grade | Tupe | Standard Number | Grade | Tupe | Standard Number | Grade | Tupe | Standard Number | Grade | Tupe | Standard Number | Grade | Tupe | Standard Number | Grade | Tupe | |
G3456 | STPT370 (STPT38) |
C | A106 | GrA | C | 3602 | HFS360 | C | 17175 | St35.8 | C | A49-211 | TU37b | C | 2604/2 | TS5 | C | C004 |
" | CFS360 | C | 17177 | St37.8 | C | A49-213 | TU37c | C | 2604/3 | TW9H | C | |||||||
" | ERW360 | C | A49-243 | TU37c | C | |||||||||||||
" | CEW360 | C | ||||||||||||||||
STPT410 (STPT42) |
C | A106 | GrB | C | 3602 | HFS410 | C | 17175 | St45.8 | C | A49-211 | TU42b | C | 2604/2 | TS9H | C | ||
" | CFS410 | C | 17177 | St42.8 | C | A49-213 | TU42c | C | ||||||||||
" | ERW410 | C | A49-243 | TU42c | C | |||||||||||||
" | CEEW410 | C | ||||||||||||||||
STPT480 (STPT42) |
C | A106 | GrC | C | 3602 | HFS460 | C | A49-211 | TU48b | C | 2604/2 | TS14 | C | |||||
" | CFS460 | C | A49-213 | TU48c | C | |||||||||||||
" | ERW460 | C | ||||||||||||||||
" | CEEW460 | C |
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.
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.
Seamless Steel Oil Well, Casing, Tubing and Drill Pipe
Steel grade: STO-G, STO-H, STO-J, STO-N, STO-C, STO-D, STO-E
Application: Seamless Steel Oil Well, Casing, Tubing and Drill Pipe
Steel grade:SCr 420TK, SCM415TK, SCM418TK, SCM420TK, SCM430TK, SCM435TK, SCM440TK
Application:Alloy Steel Tubes for General Structural Purpose
Steel grade: STK 30, STK 41, STK 50, STK 51, STK 55
Application: Carbon Steel Tubes for General Structural Purpose
Dimension Range: 21.7-1016.0 mm
Application: Carbon Steel Tubes for Machine Structural Purposes
Steel grade: STS 38, STS 42, STS 49
Application: Carbon Steel Pipes for High Pressure Service
Dimension Range: 10.5-660.4 mm
Steel grade: STPT 38, STPT 42, STPT 49
Application: Carbon Steel Pipes for High Temperature Service
Dimension Range:10.5-660.4 mm
Steel grade:STPL 39, STPL 46, STPL 70
Application: Steel Pipes for Low Temperature Service
Dimension Range:10.5-660.4 mm
Steel grade: STBL 39, STBL46, STBL 70
Application: Steel Heat Exchanger Tubes for Low Temperature Service
Dimension Range: 15.9-139.8 mm
Steel grade: STM-055, STM-C65, STM-R60, STM-1170, STM-1180, STM-R85
Application: Seamless Steel Tubes for Drilling
Dimension Range: Casing: 43-142mm / Hollow Pipes: 34-180mm / Drilling:33.5-50mm
Steel grade: STF 42, STFAl2, STFA22, STFA23, 5TFA24, STFA23, STFA26
Application:Steel Tubes for Fired Heater
Dimension Range:60.5-267.4mm
JIS G 3101 SS400 is one of the most commonly used hot rolled general structural steel.
SS400 is a Japanese brand of ordinary steel products
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 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 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.
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.
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.
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.
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.
Before cutting pipe and tubing
No matter the material, measure the diameter of the pipe or tube to be cut to ensure that you use the right-size tube cutter for the job. When determining how to make a straight cut, use a tape measure and a pencil or other writing instrument to mark on the surface where you want to cut. If possible, mark around the circumference of a pipe, especially when cutting with a handsaw. Ensure that a cut is as straight as possible by securing the pipe with a vise, clamp, miter box or even duct tape to keep the length from shifting out of place while cutting.
After cutting pipe and tubing
Seamless steel pipe is regularly used in the transportation of fluids such as water, natural gas, waste and air. It is also regularly required in many high-pressure, high-corrosive environments such as in the oil & gas, power generation and pharmaceutical industries. Some common uses of seamless pipes include:
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.
identification of the chemical composition of the metal used to manufacture the fitting. Uses PMI sensors, including X-ray fluorescence or optical emission spectrometry.
Steel pipe delivery status(condition): cold / hard (BK), cold / soft (BKW), after cold stress relief annealing (BKS), annealing (GBK), normalized (NBK).
Term | Symbol | Explanation |
Cold-finished/hard (cold-finished as-drawn) | BK | No heat treatment after the last cold-forming process. The tubes therefore have only low deformability. |
Cold-finished/soft (lightly cold-worked) | BKW | After the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits. |
Annealed | GBK | After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum. |
Normalized | NBK | The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum. |
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.
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.
Our packing can meet any needs of the customers.
Commonly used alloying elements and their effects are listed in the table given below.
Alloying Elements | Effect on the Properties |
---|---|
Chromium | Increases Resistance to corrosion and oxidation. Increases hardenability and wear resistance. Increases high temperature strength. |
Nickel | Increases hardenability. Improves toughness. Increases impact strength at low temperatures. |
Molybdenum | Increases hardenability, high temperature hardness, and wear resistance. Enhances the effects of other alloying elements. Eliminate temper brittleness in steels. Increases high temperature strength. |
Manganese | Increases hardenability. Combines with sulfur to reduce its adverse effects. |
Vanadium | Increases hardenability, high temperature hardness, and wear resistance. Improves fatigue resistance. |
Titanium | Strongest carbide former. Added to stainless steel to prevent precipitation of chromium carbide. |
Silicon | Removes oxygen in steel making. Improves toughness. Increases hardness ability |
Boron | Increases hardenability. Produces fine grain size. |
Aluminum | Forms nitride in nitriding steels. Produces fine grain size in casting. Removes oxygen in steel melting. |
Cobalt | Increases heat and wear resistance. |
Tungsten | Increases hardness at elevated temperatures. Refines grain size. |