JIS G3458 Stpa 12 Alloy Steel Pipes

• Type: Seamless
• Technique: Cold Drawn
• Material: Alloy Steel
• Surface Treatment: Varnishing
• Usage: Boiler Pipe, Hydraulic/Automobile Pipe, Special Purpose
• Section Shape: Round
• Model NO.: KM-20230215
• Transport Package: in Bundles or Wooden Cases.
• Specification: 10mm~360mm
• Trademark: KINGMETAL
• Origin: China
• HS Code: 7304511090
• Production Capacity: 2000 Tons Per Month

Product Description

JIS G3458 STPA 12 Alloy Steel Pipes

JIS G3458 standard is made for heat resistant alloy steel pipes that are used for high temperature conveying fluid pipes for heaters and boiler tubes

Diameter:10mm~360mm
Thickness:1mm~30mm.
Length:3 meter~12 meter

Table 4: Tolerance on Outside Diameter and Wall Thickness in JIS G3455, G3456, G3458, G3460

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%

Chemical Compositions(%) of JIS G3458

Grade	C	Si	Mn	P	S	Cr	Mo
STPA 12	0.10~0.20	0.10~0.50	0.30~0.80	0.035 max.	0.035 max.	-	0.45~0.65
STPA 20	0.10~0.20	0.10~0.50	0.30~0.60	0.035 max.	0.035 max.	0.50~0.80	0.45~0.65
STPA 22	0.15max.	0.50 max.	0.30~0.60	0.035 max.	0.035 max.	0.80~1.25	0.45~0.65
STPA 23	0.15max.	0.50~1.00	0.30~0.60	0.030 max.	0.030 max.	1.00~1.50	0.45~0.65
STPA 24	0.15max.	0.50 max.	0.30~0.60	0.030 max.	0.030 max.	1.90~2.60	0.87~1.13
STPA 25	0.15max.	0.50 max.	0.30~0.60	0.030 max.	0.030 max.	4.00~6.00	0.45~0.65
STPA 26	0.15max.	0.25~1.00	0.30~0.60	0.030 max.	0.030 max.	8.00~10.00	0.90~1.10

Mechanical properties

Grade	Tensile strength	Yield point or proof stress	Elongation %
	kgf/mm2 {N/mm2}	kgf/mm2 {N/mm2}	No. 11 or No.12 test piece	No. 5 test piece	No.4 test piece
			Longitudinal	Transverse	Longitudinal	Transverse
STPA 12	39{382}min.	21{206} min.	30 min.	25 min.	24 min.	19 min.
STPA 20	42{412}min.	21{206} min.	30 min.	25 min.	24 min.	19 min.
STPA 22	42{412}min.	21{206} min.	30 min.	25 min.	24 min.	19 min.
STPA 23	42{412}min.	21{206} min.	30 min.	25 min.	24 min.	19 min.
STPA 24	42{412}min.	21{206} min.	30 min.	25 min.	24 min.	19 min.
STPA 25	42{412}min.	21{206} min.	30 min.	25 min.	24 min.	19 min.
STPA 26	42{412}min.	21{206} min.	30 min.	25 min.	24 min.	19 min.