澳门新葡亰8455游戏

+86-311-89642206   |   sales@juanbang58.icu   |  
» Pipe & Tube » ASTM A312 TP304/ TP304L Pipes

ASTM A312 TP304/ TP304L Pipes

October 20, 2020

Pipes of stainless steel 304 or its low-carbon version 304L may be made in accordance with ASTM A312 Grade TP304 or TP304L, respectively. The TP304 and TP304L pipes may be furnished in seamless or straight-beam (longitudinally) welded types. They are primarily intended for high-temperature and general corrosion service. TP304/ TP304L seamless pipes shall be made by a cold-drawn or hot-rolled process that does not involve welding at any stage of production, while welded pipes shall be made using an automatic welding process with no addition of filler metal during the welding process. The pipe may be furnished with plain or bevel butt welding ends, or threaded ends in accordance with ASME B1.20.1.

ASTM A312 TP304 smls pipes in stock

ASTM A312 Gr. TP304 seamless pipes available in stock.

Chemical Composition Requirements

ElementComposition
for TP304, %
Composition
for TP304L, %
C≤0.08≤0.035
Mn≤2.00≤2.00
P≤0.045≤0.045
S≤0.030≤0.030
Si≤1.00≤1.00
Cr18.0~20.018.0~20.0
Mo8.0~11.08.0~13.0
*UNS designation of TP304: S30400; UNS designation of TP304L.

Mechanical Properties

Tensile RequirementsTP304TP304L
Tensile Strength
min. MPa [ksi]
515
[75]
485
[70]
Yield Strength
min. MPa [ksi]
205
[30]
170
[25]
Elongation in
2", min, % (*L)
3535
Elongation in
2", min, %(*T)
2525
*L: longitudinal elongation; *T: transverse elongation.

Heat Treatment

Stainless steel pipes made of austenitic stainless steel ASTM A312 TP304 or TP304L shall be solution annealed. During annealing, the pipes shall be heated to the temperature no less than 1900°F [1040°C] and soak at the temperature for a period long enough so that all chromium carbides are dissolved. Since the chromium carbide dissolves slowly, the highest practical temperature consistent with limited grain growth should be selected. This temperature is in the vicinity of 1095° [2000°F]. Complete dissolution of chromium carbides reduces precipitation of intergranular carbides hence improves the resistance to intergranular corrosion. Subsequent cooling (quenching) from the annealing temperature must be fast, thus ensuring that dissolved carbides remain in solution.

Sizes, Dimensions & Tolerances

NPS*t/DTolerance, % from Nominal
1/8"~2.5"All+20.0-12.5
3"~18"≤5%+22.5-12.5
3"~18">5%+15.0-12.5
≥20“
Wld.
All+17.5-12.5
≥20“
smls
≤5%+22.5-12.5
≥20“
smls
>5%+15.0-12.5
*t: nominal wall thickness; D: ordered outside diameter.

ASTM A312 TP304/ TP304L seamless pipes are generally furnished in sizes 1/2″ through 24″, while ASTM A312 TP304/ TP304L welded pipes are available from 1-1/2″ through 48″. The wall thicknesses shall be furnished in accordance with ASME B36.10M or ASME B36.19M. The pipes are usually supplied in lengths of 6.096 m (20′), 12.19 m (40′), 6 m, and 12 m, etc. No pipe shall be under the specified length and no pipe shall be more than 0.25″ [6 mm] over the specified length.

Inspection & Tests

Visual examination, dimensional inspection, PMI chemical analysis, tensile test, flattening test, bend test, eddy-current test, etching test, radiographic examination (for welded pipes), intergranular corrosion test (upon request).

Maybe you like also

  • ABOUT US

    We have been dedicating ourselves to piping and pipeline engineering since the inception. The company provides integrated solution to package supply of various piping & pipeline materials, components, and equipment.

  • CONTACT US

    Room 502, No.448 Heping West Road, Shijiazhuang, Hebei Province, China
    Tel: +86-311-89642206
    Fax: +86-311-67906676
    Email:  sales@juanbang58.icu
    Whatsapp: 0086-15076331069

  • Service
    Work Time: 8:30-18:00
    Welcome to contact us at your best convenience.