JIS G3462 STBA23 alloy boiler and heat exchanger tubes are a type of alloy steel tube that are specifically designed for use in high-temperature applications.
JIS G3462 STBA23 alloy boiler and heat exchanger tubes are a type of alloy steel tube that are specifically designed for use in high-temperature applications such as boilers, heat exchangers, and chemical and petroleum industries. According to the JIS G3462 standard, STBA23 tubes must have excellent metallurgical and mechanical properties, as well as resistance to oxidation and corrosion at high temperatures.
The STBA23 grade of alloy steel tubes has specific chemical composition requirements, which include a minimum chromium (Cr) content of 1.90%-2.60%, a minimum molybdenum (Mo) content of 0.87%-1.13%, and a minimum tensile strength of 60ksi (415MPa). These tubes can be produced in both seamless and electric resistance welded forms, and they may also be used for U-bend applications.
JIS G3462 STBA23 alloy boiler and heat exchanger tubes are commonly used in applications where a high-temperature environment is present, such as steam boilers, heat exchangers, and furnaces. They are highly resistant to corrosion and oxidation at elevated temperatures and provide excellent heat transfer properties.
| Designation of grade | Heat treatment a) |
|---|---|
| STBA23 | Isothermal annealing, full annealing or normalizing followed by tempering b) |
Notes : Low temperature annealing shall not be applied to the electric resistance welded steel tube.
The tempering temperature for JIS G3462 STBA22 Alloy steel tubes shall be 650°C or higher.
| Standard:JIS G3462 | Grade | Chemical Composition Limits (%) | ||||||
|---|---|---|---|---|---|---|---|---|
| C | Si | Mn | P | S | Cr | Mo | ||
| STBA23 | ≤ 0.15 | 0.50-1.00 | 0.30-0.60 | ≤ 0.030 | ≤ 0.030 | 1.00-1.50 | 0.45-0.65 | |
| Designa tion of grade |
Tensile strength a) N/mm 2 |
Yield point or proof stress N/mm 2 |
Elongation % | ||||
| Outside diameter | |||||||
| Under 10 mm | 10 mm or over to and excl. 20 mm | 20 mm or over | All diameters | ||||
| Tensile test piece | |||||||
| No. 11 test piece | No. 11 test piece | No. 11 test piece or No.12 test piece | No.4 test piece | No.14A test piece | |||
| Tensile test direction | |||||||
| Pararell to tube axis | Pararell to tube axis | Pararell to tube axis | Pararell to tube axis | Pararell to tube axis | |||
| STBA23 | 410 min. | 205 min. | 22 min. | 25 min. | 30 min. | 24 min. | 21 min. |
NOTE: 1 N/mm 2 = 1 MPa
Tolerances of Wall Thickness
| Tolerances | Division of wall thickness (mm) |
Division of method of manufacture | Hot finished seamless steel tube | Cold finished seamless steel tube | Electric resistance welded steel tube | |||
|---|---|---|---|---|---|---|---|---|
| Division of outside diameter (mm) | Under 100 | 100 or over | Under 40 | 40 or over | Under 40 | 40 or over | ||
| Tolerances on wall thickness % | Under 2 | --- | --- | +0.4mm | +22 0 |
+0.3 | +18 0 |
|
| 0 | 0 | |||||||
| 2 or over to and excl. 2.4 | +40 | --- | +20 0 |
+18 0 |
||||
| 0 | ||||||||
| 2.4 or over to or excl. 3.8 | +35 | +35 | ||||||
| 0 | 0 | |||||||
| 3.8 or over to or excl. 4.6 | +33 | +33 | ||||||
| 0 | 0 | |||||||
| 4.6 or over | +28 | +28 | ||||||
| 0 | 0 | |||||||
| Tolerances on thickness disparity% |
--- | Within 22.8 of wall thickness | --- | --- | ||||
Tolerances of Outside Diameter
| Division of outside diameter | Tolerances on outside diamete | |||
|---|---|---|---|---|
| Hot finished seamless steel tube | Cold finished seamless steel tube | Electric resistance welded steel tube other than cold finished | Cold finished electric resistance welded steel tube | |
| Under 25 | +0.4 -0.8 |
【0.10 | 【1.5 | 【0.10 |
| 25 or over to and excl. 40 | 【0.15 | 【0.20 | 【0.15 | |
| 40or over to and excl. 50 | 【0.20 | 【0.25 | 【0.20 | |
| 50 or over to and excl 60 | 【0.25 | 【0.30 | 【0.25 | |
| 60 or over to and excl. 80 | 【0.30 | 【0.40 | 【0.30 | |
| 80 or over to and excl. 100 | 【0.40 | +0.40 | 【0.40 | |
| -0.60 | ||||
| 100 or over to and excl.12 | +0.4 -1.2 |
+0.40 -0.60 |
+0.40 -0.80 |
+0.40 |
| -0.60 | ||||
| 120 or over to and excl.160 | +0.40 -0.80 |
+0.40 -1.00 |
+0.40 | |
| -0.80 | ||||
| 160 or over to and excl.200 | +0.4 | +0.40 | +0.40 | +0.40 |
| -1.8 | -1.20 | -1.20 | -1.20 | |
| 200 or over | +0.4 | +0.40 | +0.40 | +0.40 |
| -2.4 | -1.60 | -1.60 | -1.60 | |
Tolerances of Length
| Division | Tolerance on length | ||
|---|---|---|---|
| 50 mm or under in outside diameter |
7 m or under in length | +0.7 mm | |
| 0 | |||
| Over 7 m in length | Add 3 mm to the plus side permissible deviation given above for each increase of 3m or its fraction in length. However, the maximum value shall be 15 mm. | ||
| Over 50 mm in outside diameter |
7 m or under in length | +10mm | |
| 0 | |||
| Over 7 m in length | Add 3 mm to the plus side permissible deviation given above for each increase of 3m or its fraction in length. However, the maximum value shall be 15mm. | ||
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 G3101 SS400 is one of the most commonly used hot rolled general structural steel.
SS400 is a Japanese brand of ordinary steel products
With years of expertise, we provide a wide range of steel tube processing services. From basic sawing and machining to complex bending and upsetting operations, we support you at every stage of your project.
Our capabilities include eccentricity reduction and concentricity improvement through turning and grinding. We specialize in creating complex geometries using rotary swaging and axial forming, and offer property modifications through partial heat treatment to meet your exact requirements.
Alloy steel pipes are widely used in high-temperature, high-pressure and corrosive service environments where conventional carbon steel pipes cannot provide sufficient mechanical strength or long-term reliability.
Manufactured from premium alloy steels containing chromium, molybdenum, nickel and other alloying elements, these pipes provide excellent resistance to heat, pressure, oxidation and corrosion, making them ideal for demanding industrial processes.
Alloy steel pipes offer superior performance under severe operating conditions. Their enhanced mechanical properties provide excellent resistance to elevated temperatures, internal pressure, corrosion and long-term creep deformation.
Alloy steel pipes are selected for critical applications where operating temperatures, pressures or corrosive media exceed the capabilities of carbon steel.
| Service Condition | Typical Application |
|---|---|
| High Temperature | Boilers, superheaters, steam headers |
| Low Temperature | Cryogenic processing systems |
| High Pressure | Power generation and process piping |
| Corrosive Media | Chemical and petrochemical plants |
| Long-Term Creep Service | Thermal power stations |
| Product Type | Common Standards |
|---|---|
| Seamless Pipes | ASTM A335 P1, P5, P9, P11, P22, P91 |
| Butt Weld Fittings | ASTM A234 WP1, WP5, WP9, WP11, WP22, WP91 |
| Forged Fittings & Flanges | ASTM A182 F1, F5, F9, F11, F22, F91 |
Sunny Steel supplies alloy steel piping products to customers worldwide across a wide range of industrial sectors. Our products are manufactured to international standards and are trusted in critical piping systems requiring long-term reliability.
Chemical composition inspection, mechanical properties test(tensile strength,yield strength, elongation, flaring, flattening, bending, hardness, impact test), surface and dimension test, non-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.
