JIS G3461 STB340 boiler and heat exchanger tubes

JIS G3461 STB340 boiler and heat exchanger tubes are a type of carbon steel tube specifically designed for high-temperature and high-pressure applications.

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JIS G3455 STS 370 seamless carbon steel pipes

JIS G3461 STB340 boiler and heat exchanger tubes are a type of carbon steel tube specified by the Japanese Industrial Standard (JIS) G3461. These tubes are used in boilers, heat exchangers, and similar equipment for high-temperature service.

JIS G3461 is the grade designation for this type of carbon steel tube. It has a minimum tensile strength of 340 MPa and a minimum yield strength of 175 MPa.

JIS G3461 STB340 boiler and heat exchanger tubes have excellent corrosion resistance and high-temperature strength. They are also easy to fabricate and can be welded by various methods.

These tubes are typically produced in seamless form and are available in various sizes and thicknesses. They are widely used in industrial applications such as power generation, petrochemical, and refineries.

JIS G3461 STB340 boiler and heat exchanger tubes are a type of carbon steel tube specifically designed for high-temperature and high-pressure applications.

Heat treatment of JIS G3461 STB340 boiler and heat exchanger tubes

Grade Heat treatment
Hot finished seamless steel tube Cold finished seamless steel tube Electric resistance welded steel tube other than hot finished or cold finished steel tube Finished electric resistance welded steel tube Fold  finished  electric resistance welded steel tube
STB 340 As manufactured, as required, low temperature  annealing  or normalizing may be performed. Low temperature
annealing,normalizing or full annealing.
Normalizing As manufactured. However, as required, low temperature  annealing  or normalizing may be performed Normalizing

Chemical Composition of JIS G3461 STB340 boiler and heat exchanger tubes

Standard Grade Chemical Composition Limits (%)
C Si Mn P S
JIS G3461 STB 340 ≤ 0.18 ≤ 0.3 0.30-0.60 ≤ 0.035 ≤ 0.035

Mechanical Properties of JIS G3461 STB340 boiler and heat exchanger tubes

Grade Tensile Property (N/mm2) Yield Point or Yield Strength (N/mm2) Rockwell hardness HRB Elongation (%)
OD ≥20 mm 10 mm ≤OD <20 mm OD <10 mm
Longitudinal Transverse Transverse
STB 340 ≥ 340 ≥ 175  77 max. ≥ 35 ≥ 30 ≥ 27

Note:The above table is only applicable for heat exchanger carbon steel tubes. The buyer can appoint the upper limit value of tensile strength. The upper limit value of tensile strength is the above shown value plus 120 N/mm2.

Appearance

(1)The pipe are practically straight, and its both ends shall be at a right angle to its axis.
(2) The inside and outside surfaces of the pipe shall be well-finished and free form defects that are detrimental to practical use.

Testings

(1)Chemical analysis
(2)Tensile Test
(3)Flattening Test
(4) Bending Test
(5) Hydrostatic Test or Nondestructive Examination

JIS G3461 Carbon Steel Pipes Dimensions Tolerance

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.  

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.

JIS G3439

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

JIS G3441

Steel grade:SCr 420TK, SCM415TK, SCM418TK, SCM420TK, SCM430TK, SCM435TK, SCM440TK
Application:Alloy Steel Tubes for General Structural Purpose

JIS G3444

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

JIS G3455

Steel grade: STS 38, STS 42, STS 49
Application: Carbon Steel Pipes for High Pressure Service
Dimension Range: 10.5-660.4 mm

JIS G3456

Steel grade: STPT 38, STPT 42, STPT 49
Application: Carbon Steel Pipes for High Temperature Service
Dimension Range:10.5-660.4 mm

JIS G3460

Steel grade:STPL 39, STPL 46, STPL 70
Application: Steel Pipes for Low Temperature Service
Dimension Range:10.5-660.4 mm

JIS G3464

Steel grade: STBL 39, STBL46, STBL 70
Application: Steel Heat Exchanger Tubes for Low Temperature Service
Dimension Range: 15.9-139.8 mm

JIS G3465

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

JIS G3467

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

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

Seamless tube processing

With years of expertise, we provide a diverse array of steel tube processing options. From sawing and machining tube blanks to intricate bending and upsetting operations, we actively assist you throughout your projects.

Our capabilities extend to eccentricity reduction and concentricity enhancement through turning and grinding. We excel in creating complex geometries using processes like rotary swaging and axial forming. Additionally, we offer property modifications via partial heat treatment, ensuring tailored solutions for your specific needs.

Variable wall thicknesses

Variable wall thicknesses

Drilling / stamping / lasering

Drilling / stamping / lasering

Peeling / roller burnishing

Peeling / roller burnishing

Cold forming

Cold forming

Cutting

Cutting

Beveling

Beveling

Deburring

Deburring

Thread rolling / threading

Thread rolling / threading

Partial hardening

Partial hardening

Turning / milling / grinding

Turning / milling / grinding

Reducing / expanding

Reducing / expanding

Machining

Machining

【H】 Ceramic lined pipe

Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.

【H】 Cast basalt lined steel pipe

Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.

【H】 Ceramic Tile Lined Pipes

Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.

【H】 Rare earth alloy wear-resistant pipe

The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.

【H】 Tubes Erosion Shields

Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.

【H】 ASTM A213 T91 Alloy Tube

The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.

Ni-Hard Wearback Pipes Ni-Hard Wearback Pipes
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