JIS G3461 STB410 BOILER AND HEAT EXCHANGER TUBES

JIS G3461 STB 410 Boiler and Heat Exchanger Tubes

Standard: JIS G3461 Carbon Steel Tubes for Boiler and Heat Exchanger

JIS G3461 STB 410 specifies the carbon steel tubes, hereinafter referred to as the “tubes”, used for exchanging heat on the inside and outside of the tube, such as water tubes, smoke tubes, superheater tubes, air preheater tubes, etc. of the boiler, and heat exchanger tubes, condenser tubes, catalyzer tubes, etc. used in chemical and petroleum industries.

JIS G3461 STB 410 Boiler and Heat Exchanger Tubes Quick Details
Manufacture:Seamless; Electric resistance welded, Cold finished ,Hot finished
Wall thickness(WT): 2.0 mm——12.7 mm.
Outer diameter (OD): 25 mm——139.8 mm
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Treaded

Method of manufacture
Seamless; Electric resistance welded, Cold finished ,Hot finished

Heat Treatment of JIS G3461 STB 410 Boiler and Heat Exchanger Tubes

Grade	Heat treatment
Grade	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 410	As manufactured. However, as required, low temperature annealing or normalizing may be performed.	Low temperature annealing, normalizing or full annealing.	Normalizing	Low temperature annealing

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 410 Boiler and Heat Exchanger Tubes

Standard:JIS G3461	Grade	Chemical Composition Limits (%)
	Grade	C	Si	Mn	P	S
	STB 410	≤ 0.32	≤ 0.35	0.30-0.80	≤ 0.035	≤ 0.035

Mechanical Properties of JIS G3461 STB 410 Boiler and Heat Exchanger Tubes

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 410	≥ 410	≥ 255	79 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.

The dimensional tolerances of .JIS G3461 Carbon Steel Tubes for Boiler and Heat Exchanger

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		—		—

Tolerances of Outside Diameter

Division of outside diameter	Tolerances on outside diamete
Division of outside diameter	Hot finished seamless steel tube	Cold finished seamless steel tube	Electric resistance welded steel tube other than cold finished	Cold finished electric resistance welded steel tube
Under 25	+0.4 -0.8	【0.10	【1.5	【0.10
25 or over to and excl. 40		【0.15	【0.20	【0.15
40or over to and excl. 50		【0.20	【0.25	【0.20
50 or over to and excl 60		【0.25	【0.30	【0.25
60 or over to and excl. 80		【0.30	【0.40	【0.30
80 or over to and excl. 100		【0.40	+0.40	【0.40
80 or over to and excl. 100		【0.40	-0.60	【0.40
100 or over to and excl.12	+0.4 -1.2	+0.40 -0.60	+0.40 -0.80	+0.40
100 or over to and excl.12		+0.40 -0.60	+0.40 -0.80	-0.60
120 or over to and excl.160		+0.40 -0.80	+0.40 -1.00	+0.40
120 or over to and excl.160		+0.40 -0.80	+0.40 -1.00	-0.80
160 or over to and excl.200	+0.4	+0.40	+0.40	+0.40
160 or over to and excl.200	-1.8	-1.20	-1.20	-1.20
200 or over	+0.4	+0.40	+0.40	+0.40
200 or over	-2.4	-1.60	-1.60	-1.60

Tolerances of Length

Division		Tolerance on length
50 mm or under in outside diameter	7 m or under in length	+0.7 mm
		0
	Over 7 m in length	Add 3 mm to the plus side permissible deviation given above for each increase of 3m or its fraction in length. However, the maximum value shall be 15 mm.
Over 50 mm in outside diameter	7 m or under in length	+10mm
		0
	Over 7 m in length	Add 3 mm to the plus side permissible deviation given above for each increase of 3m or its fraction in length. However, the maximum value shall be 15mm.

Appearance
（1）The tube are practically straight and its both ends shall be at right angles to its axis.
（2）The inside and outside surfaces of the tube are well-finished and free from defects injurious to use.

Testings
(1)Chemical Analysis
(2)Tensile Test
(3)Flattening Test
(4) Flaring Test
(5) Reverse flattening Test
(6)Hydrostatic Test or Nondestructive Examination

Marking
Each tube having passed the inspection shall be marked with the following items. However, the order of arranging the items is not specified. Further, in the case of either smaller tubs or request from the purchaser, the tubes may be bundled together and marked for each bundle by a suitable means.

(1) Class symbol(STB 410)
(2) Letter symbol indication the manufacturing method ()
(3) Dimensions
(4) Manufacturer’s name or its abbreviation
(5) Letter symbol Z indicating the designation of special quality requirements
Note () Symbols for indicating the manufacturing method shall be as follows. However, – may be replaced by a blank.
Hot finished seamless steel tube -S –H
Cold finished seamless steel tube -S –C
Electric resistance welded steel tube other than Hot finished and cold finished -E –G
Hot finished electric resistance welded steel tube -E –H
Cold finished electric resistance welded steel tube -E -C

Report
We will, in general, submit to the purchaser a detailed statement of the test results, method of manufacture, ordered dimensions, quantity, work number indicating the history of manufacture, etc.