JIS/G3456高圧サービス用の炭素鋼パイプ

Standard

Grade

C

Si

Mn

P

S

JIS G3456

STPT370

≤0.25

0.10-0.35

0.30-0.90

≤0.035

≤0.035

STPT410

≤0.30

0.10-0.35

0.30-1.00

≤0.035

≤0.035

STPT480

≤0.33

0.10-0.35

0.30-1.00

≤0.035

≤0.035

Standard

Grade

Yield Strength (Mpa)

Tensile Strength (Mpa)

Elongation (%)

JIS G3456

STPT370

≥216

≥370

≥30

STPT410

≥245

≥410

≥25

STPT480

≥275

≥480

≥25

Division

Tolerances on outside diameter

Tolerances on wall thickness

Tolerance on deviation in wall thickness

Hot finished seamless steel pipe

Up to 50 mm 【0.5mm

≤Up to 4 mm
【0.5mm

Up to and incl. 20 % of
wall thickness

50mm and over, up to 160mm
【1%

160mm and over, up to 200mm
【1.6mm

≤4mm and over
【12.5%

200mm and over 【0.8%

However, for pipes 350mm and over in diameter, the length of circumference may
substitute as a basis for tolerances, In this case, the tolerances shall be 【0.5%.

Cold finished seamless steel
pipe

Up to 40mm 【0.3mm

≤Up to 2 mm
【0.2mm

-

40mm and over 【0.8%

≤2mm and over
【10%

However, for pipes 350mm and over in diameter, the length of circumference may
substitute as a basis for tolerances. In this case, the tolerances shall be 【0.5%