JIS G3445 STKM 11A Carbon Steel Tubes for Machine Structural Purposes, STKM 11A, STKM 12A, STKM 12B, STKM 12C, STKM 13A, STKM 13B, STKM 13C, STKM 14A, STKM 14B, STKM 14C, STKM 15A, STKM 15C, STKM 16A, STKM 16C, STKM 17A, STKM 17C, STKM 18A, STKM 18B, STKM 18C, STKM 19A, STKM 19C, STKM 20A

JIS G3445 Carbon Steel Tubes for Machine Structural Purposes

Standard: JIS G3461
Equivalent Standards: ASTM A192, EN 10216-1, EN 10216-2, DIN 17175, BS 3059 Part II, NF A 49-213, NBR 5594, GB 3087, GB 5310, ISO 9329-2, ISO 9330-2

Material: STB340
Equivalent Materials: 1010, St35.8, 360, P195TR1 (1.0107), P195TR2 (1.0108), P195GH, 10#, 12G, SA192, 0.1-0.15C

Chemistry Composition

C, %	Mn, %	Si, %	P, %	S, %
0.18 max	0.30-0.60	0.35 max	0.035 max	0.035 max

Mechanical Properties

Tensile Strength , MPa	Yield Strength , MPa	Elongation, %	Hardness, HRB
340 min	175 min	35 min	77 max

Outside Diameter & Tolerance

Hot rolled	Outside Diameter, mm	Tolerance, mm
	OD＜100	+0.4/-0.8
	100≤OD＜160	+0.4/-1.2
	160≤OD＜200	+0.4/-1.8
	OD≥200	+0.4/-2.4

Cold Drawn	Outside Diameter, mm	Tolerance, mm
	OD＜25	±0.10
	25≤OD＜40	±0.15
	40≤OD＜50	±0.20
	50≤OD＜60	±0.25
	60≤OD＜80	±0.30
	80≤OD＜100	±0.40
	100≤OD＜120	+0.40/-0.60
	120≤OD＜160	+0.40/-0.80
	160≤OD＜200	+0.40/-1.20
	OD≥200	+0.40/-1.60

Wall thickness & Tolerance

Hot rolled	Outside Diameter, mm	Tolerance, %
	OD＜100, WT＜2.0	-
	OD＜100, 2.0≤WT＜2.4	+40/-0
	OD＜100, 2.4≤WT＜3.8	+35/-0
	OD＜100, 3.8≤WT＜4.6	+33/-0
	OD＜100, WT≥4.6	+28/-0
	OD≥100, WT＜2.0	-
	OD≥100, 2≤WT＜2.4	-
	OD≥100, 2.4≤WT＜3.8	+35/-0
	OD≥100, 3.8≤WT＜4.6	+33/-0
	OD≥100, WT≥4.6	+28/-0
Cold Drawn	Outside Diameter, mm	Tolerance, %
	OD＜40, WT＜2.0	+0.40mm/-0mm
	OD＜40, WT≥2.0	+20/-0
	OD≥40	+22/-0

JIS G3461 specifies the carbon steel tubes used in chemical and petroleum industry, such as water tubes, smoke tubes, superheater tubes, air preheater tubes, etc.

Manufacture: tubes shall be made by the seamless process and shall be either hot-finished or cold-finished, as specified.
Heat Treatment: hot-finished tubes need not be heat treated. Cold finished tubes shall be heat treated after the final cold-finishing at a temperature of 1200°F [650°C] or higher.
Inspection & Test: chemistry composition analysis, tensile test, flattening test, flaring test, hardness test, NDT, surface inspection and dimension check.

Length: 5000mm; 6000mm; 9000mm; 12000mm; and so on.
Max length: 30000mm, U bending can be offered, also see the fin tubes.

Keyword: heat exchanger steel tubes, JIS G3461, STB340, STB410, STB510

Home | About Us | Product | Know How | Contact Us