jis g3454 carbon steel pipes, carbon steel pipes for pressure service

JIS G3454 carbon steel pipes for pressure service

Date:2024-06-17

Size Involving JIS G3454 Carbon Steel Pipe

Outer Dimensions: Ranging from 19.05 mm to 114.3 mm.

Wall Thickness: Varying from 2.0 mm to 14 mm.

Maximum Length: Up to 16000 mm.

Advantages of JIS G3454 Carbon Steel Pipe

Precision Control: Utilizing advanced rolling technology, we can maintain size tolerances within the limits prescribed by the standard, and often achieve even tighter tolerances.

Custom Sizes: We offer a wide range of carbon steel tube sizes and can customize dimensions according to customer requirements.

Specifications of JIS G3454 Carbon Steel Tube

1. Mechanical Properties

Grade	Tensile Property (N/mm2)	Yield Point or Yield Strength (N/mm2)	Elongation (%)
			NO. 11 Sample; NO. 12 Sample	NO. 5 Sample	NO. 4 Sample
			Longitudinal	Transverse	Longitudinal	Transverse
STPG370	≥370	≥215	≥30	≥25	≥28	≥23
STPG410	≥410	≥245	≥25	≥20	≥24	≥19

Note:
1. For the carbon steel pipes with the thickness of less than 8 mm, we use NO.12 or NO.5 sample for tensile test. The minimum elongation will be reduced by 1.5% from the table value when the thickness reduces 1 mm. The value obtained will be rounded to an integer value according to JIS Z8401 (a rounding method).
2. The above elongation is not applicable to the carbon steel tubes with the nominal pipe diameter of equal to or less than 25A. This must be recorded.
3. When we take the electric resistance welded steel pipes for tensile test, we also choose NO.12 or NO.5 sample from the parts not containing welding seams. For the carbon steel pipes with the thickness of less than 8 mm, we use the elongation of NO.12 sample (longitudinal) or NO.5 sample (transverse) to calculate.

Grade	Sample Shape	Elongation differs according to the wall thickness. (%)
Grade	Sample Shape	＞7~＜8	＞6~＜7	＞5~＜6	＞4~＜5	＞3~＜4	＞2~＜3	＞1~＜2
STPG370	NO.12 Sample	30	28	27	26	24	22	21
STPG370	NO.5 Sample	25	24	22	20	19	18	16
STPG410	NO.12 Sample	25	24	22	20	19	18	16
STPG410	NO.5 Sample	20	18	17	16	14	12	11

2. Chemical Composition of Carbon Steel Tube (Unit: %)

Grade	C	Si	Mn	P	S
STPG370	≤0.25	≤0.35	0.30-0.90	≤0.040	≤0.040
STPG410	≤0.30	≤0.35	0.30-1.00	≤0.040	≤0.040

3. Allowable Deviation of Outer Diameter and Wall Thickness

Type	Allowable Deviation of Outer Diameter		Allowable Deviation of Wall Thickness
Hot-Working Seamless Steel Tube	≤40A	±0.5 mm	＜4 mm	﹢0.6mm 0.5
	≥30A≤125A	±1%
	150A	±1.6 mm
	≥200A	±0.8%	≥4mm	﹢15%﹣12.5%
	For≥350A ones, we can measure according to the perimeter. The allowable deviation is±0.5%.
Cold-Working Seamless Steel Pipe and Electric-Resistance Welded Steel Pipe	≤25A	±0.03 mm	＜3 mm≥3 mm	±0.3 mm±10%
	≥32A	±0.8%
	For≥350A ones, we can measure according to the perimeter. The allowable deviation is±0.5%.

Note:
1. When we measure the outer diameter through perimeter, we can determine by converting circumference measurement or measured valueto be the outer diameter. Both are applicable to the same tolerance (±0.5%).
2. For the repaired parts, confirm the wall thickness tolerance meets the above table. The outer diameter tolerance is not applicable to the table.
3. The appearance of carbon steel pipes used below 350℃is regulated by the following provisions:
1) The carbon steel tube should be straight with practicality. Its ends must be perpendicular to the tube axis.
2) The inner and outer of tube should be processed well without harmful defects.
4. Size and Weight of Carbon Steel Pipe