STB 510 Boiler Tubes

Release Tme: 2023-11-23

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Heat Treatment of JIS G3461 STB 510

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 510	Normalizing

Note:The cold finished electric resistance welded steel tube which has been normalized prior to cold finishing may be finished by annealing.
Chemical Composition of JIS G3461 STB 510

Standard:JIS G3461	Grade	Chemical Composition Limits (%)
	Grade	C	Si	Mn	P	S
	STB 510	≤ 0.25	≤ 0.35	1.00-1.50	≤ 0.035	≤ 0.035

Mechanical Properties of JIS G3461 STB 510

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 510	≥ 510	≥ 295	92 max.	≥ 25	≥ 20	≥ 17

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.
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		---		---

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