Stainless-Steel-Industry-Pipe-02

ASTM A312 TP304L Welded Stainless Steel Pipe

We offer ASTM A312 TP304L welded stainless steel pipe, intending for high-temperature and general corrosive service, TP304L stainless steel is low carbon TP304 grade, having excellent corrosion resistance, pipe size range as ANSI B36.10, ANSI B36.19.

ASTM A312 TP304L Stainless Steel Pipe

ASTM A312 covers seamless, straight-seam welded, and heavily cold worked welded stainless steel pipe, when larger diameter welded pipes, welding two longitudinal sections is allowed.

ASTM A312 pipe size range from NPS 1/8 inch to 30 inch with Wall thickness from Sch5 to Sch160 depending on ANSI Pipe Schedule B36.19 & B36.10, manufactured starting from billet by cold drawn & cold rolling process, beside TP304L, other grades include 304, 316L, 321/321H, 317/317L, S31803/2205, 904L and duplex steel, common finish in annealing and pickling, plain ends and beveled ends for chosen to meet specific requirement.

Manufacturing

ERW or EFW welding method is usually used for ASTM A312 welded pipe, often single longitudinal welding is used, for large diameter pipe, double longitudinal welding is accepted.

No additional metal using automatic welding process for welded pipe, made from stainless steel strip or plate, both single welding and double welding for option, smail diameter and arge diameter are available, annealing pickling finish.

Heat Treatment

ASTM A312 TP304L grade minimum solution temperature is 1040 degree, then and cool rapidly, it can not be harden by annealing, both seamless and welded stainless steel pipes shall be furnished in heat treatment condition comply to ASTM A312 specification.

Quality Control For ASTM A312 Tubes

ISO9001:2008 & PED approved manufacturer with more than 10 years experiences in TP304L stainless steel pipe, mill test certificate offered as EN10204/3.1, quality control from raw material to final products, testing and inspection comply with specification, standard testing and optional testing as following, The third party testing accepted, like TUV, SGS, INTERTEC and BV, to ensure our products high quality.

・ Mechanical Tests
・Grain Size Determinations
・Weld Decay Tests
・Transverse or Longitudinal Tension Test
・Flattening Test
・Grain Size
・Hydrostatic or Nondestructive Electric Test
・Flattening Test(option)
・Radiographic Examination(option)
・Intergranular Corrosion Test(option)

Tubing Specifiction

Pipe sizes are based on ANSI B36.19, outside diameter ranges from NPS 1/8 inch to 30 Inch, that is 10.3 to 762 mm, DN 6 to DN 750, wall thickness ranges from Sch 5S to 80S.

Small diameter pipe, thin wall pipe and heavy wall pipe are available on request.

We should notice that pipe sizes under NPS 14 inch is not actual diameter, for example, NPS 8 inch, it is 219.08 mm, not 203.2 mm.

Nominal Size OD Wall Thickness, SCHEDULE
NPS DN Mm 5S 10S 40S STD 80S
1∕8 6 10.3 1.24 1.73 1.73 2.41
1∕4 8 13.7 1.65 2.24 2.24 3.02
3∕8 10 17.2 1.65 2.31 2.31 3.2
1∕2 15 21.3 1.65 2.11 2.77 2.77 3.73
3∕4 20 26.7 1.65 2.11 2.87 2.87 3.91
1 25 33.4 1.65 2.77 3.38 3.38 4.55
1 1∕4 32 42.2 1.65 2.77 3.56 3.56 4.85
1 1∕2 40 48.3 1.65 2.77 3.68 3.68 5.08
2 50 60.3 1.65 2.77 3.91 3.91 5.54
2 1∕2 65 73 2.11 3.05 5.16 5.16 7.01
3 80 88.9 2.11 3.05 5.49 5.49 7.62
3 1∕2 90 101.6 2.11 3.05 5.74 5.74 8.08
4 100 114.3 2.11 3.05 6.02 6.02 8.56
5 125 141.3 2.77 3.4 6.55 6.55 9.53
6 150 168.3 2.77 3.4 7.11 7.11 10.97
8 200 219.1 2.77 3.76 8.18 8.18 12.7
10 250 273.1 3.4 4.19 9.27 9.27 12.7
12 300 323.9 3.96 4.57 9.53 9.53 12.7
14 350 355.6 3.96 4.78 9.53
16 400 406.4 4.19 4.78 9.53
18 450 457.2 4.19 4.78 9.53
20 500 508 4.78 5.54 9.53
22 550 558.8 4.78 5.54 9.53
24 600 609.6 5.54 6.35 9.53
26 650 660.4 9.53
28 700 711.2 9.53
30 750 762 6.35 7.92 9.53

ASTM A312 Stainless Steel Pipe Tolerances

OD Tolerance WTH(Mm)
10.3-48.3 +0.40/-0.80 +/-12.5%T
>48.3-114.3 +0.80/-0.08
>114.3-219.1 +1.60/-0.80
>219.1-457.2 +2.40-0.80
>457.2-660.4 +3.20/-0.80
>660.4-864 +4.00/-0.08
>864-1219.2 +4.80/-0.08

Surface Finish

・ Annealing Pickling
・ As Welded

Material and Composition

304L is low carbon 304 Austenitic stainless steel, carbon content not exceeding 0.035%, excellent corrosion resistance suited to a wide range of applications, in Europe, equivalent steel is 1.4307.

C Mn P S Si Ni Cr N
TP304L 0.035 2.00 0.045 0.030 1.0 8-13 18-20
1.4307 0.030 0.80 0.040 0.015 1.0 8-10 17.5-19.5 0.11

ASTM A312 TP304L Mechanical Properties

Tensile Strength
(Mpa) Min
Yield Strength
(Mpa) Min
Elongation
(%)
Hardness (HRB) Max
TP304L 485 170 35 90
1.4307 480-680 180 35 90

Product Delivery and Packaging

・ Bundles, outside with plastic bag
・ Small bundles in plywood case
・ Steel frame case
・ Plywood case
・ Plastic bag for single large diameter pipes
・ U bending tubes package
・ Tube ends with caps, each tube with plastic bag

A312 Stainless Steel Tube Applications

ASTM A312 stainless steel pipe is widely used for high temperature service and general service

Scroll to Top