ASTM A270 TP304 Welded Tube supplier

What is the A270 material specification?
ASTM A270 covers seamless, welded, and heavily cold-worked austenitic and ferritic/austenitic stainless steel sanitary pipe. Seamless pipe shall be produced without welding at any stage. Welded pipe shall be welded using an automatic process without the addition of any filler metal. Heavy cold-worked pipe shall be produced by cold working the welded pipe prior to final annealing to a minimum of 35% reduction in wall and weld thickness. No filler material shall be used during welding. All material shall be supplied in the heat-treated condition.

A270 Type 304 stainless steel tubing is typically produced in both seamless and welded forms. A270 Type 304 seamless sanitary stainless steel tubing is manufactured using an extrusion process, where a hot steel billet is extruded through a die to achieve precise dimensions. Because there are no welds, these tubes offer higher strength and load-bearing capacity than ASTM A270 TP304 welded sanitary stainless steel tubing. However, welded tubing is less expensive than seamless tubing and can be manufactured in a wider range of sizes, which is not possible with seamless tubing. We maintain strong relationships with our supply chain, enabling us to deliver the best products to you in a short timeframe. If you have any questions about our products or pricing, please contact us or visit our website for more information.

ASTM A270 TP304 Welded Tube

What is the surface finish of ASTM A270?
Surface finish is 20 µ-in Ra (0.5 µm) ID maximum, 30 µ-in Ra (0.8 µm) OD maximum surface roughness measured per ASME/ANSI B46. 1 with the profilometer reading at 90 degrees to the lay.

Specification

Chemical Composition of ASTM A270 TP304

Grade		Ni	Cr	Si	Mn	C	P	S
TP304	Min	8.0	18.0
TP304	Max	11.0	20.0	1.0	2.0	0.08	0.045	0.03

Mechanical Properies of ASTM A270 TP304 Welded pipe

Grade	Tensile Str Ksi(Mpa)	Yield Str Ksi(Mpa)	Elongation(%)	Rockwell Hardness

TP304	≥75(515)	≥30(205)	≥35	≤B90

Dimension Toleances

Size,Outside Diameter,in.(mm)	Permissible Variations in Outside Diameter,in.(mm)		Permissible Variations in Outside Diameter,in.(mm)
	Over	Under	Over	Under
1.000(25.4) and under	0.005(0.13)	0.005(0.13)	1/8(3.2)	0
Over 1(25.4) to 2(50.8)	0.008(0.20)	0.008(0.20)	1/8(3.2)	0
Over 2(50.8) to 3(76.2)	0.010(0.25)	0.010(0.25)	1/8(3.2)	0
Over 3(76.2) to 4(101.6)	0.015(0.38)	0.015(0.38)	1/8(3.2)	0
Over 4(101.6) to 5 1/2(139.7),excl	0.015(0.38)	0.015(0.38)	3/16(4.8)	0
5 1/2(139.7) to 8(203.2),excl	0.030(0.76)	0.030(0.76)	3/16(4.8)	0
8(203.2) to 12 (304.8)	0.050(1.27)	0.050(1.27)	3/16(4.8)	0

Why choose GNEE

GNEE specializes in manufacturing precision stainless steel seamless pipes, BA pipes, EP mother pipes, clean pipes and special alloy pipes.
There are 24 cold rolling mills, 6 cold rolling mills (one imported), 2 fully automatic ultrasonic cleaning machines, 4 bright annealing furnaces, 4 automatic pipe cutting machines (2 imported) and other main equipment, and it is equipped with hydraulic universal testing machines, electronic thickness gauges, metallographic microscopes and other testing equipment.

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Testing and Inspection

Each tube shall be subjected to the nondestructive electric test or hydrostatic test, Manufacturer Material Test Certification as per EN 10204 3.1 should be provided.

Tensile property, Elongation
Hardness testing, Brinell, Rockwell, Vickers hardness
Flattening testing
Flaring testing
Hydrostatic or Nondestructive test
Intergranular Corrosion Test – ASTM A262/E (option)