ASTM A312 TP304L 1/2 inch SCH 5S Tig Welded Stainless Steel Tube
In order to comply with this specification welded stainless steel
tube must be manufactured by an automatic welding process using no
filler metal, or it must be a seamless pipe. If a welded stainless
steel tube has a nominal pipe size greater than 14'' then it may be
constructed from two longitudinal sections, and hence have two
longitudinal welds. The pipe may be either hot finished or cold
Finish and repair:
The surface of the welded stainless steel tube must be clean and
free of scale and contaminating iron particles. It can be bright
annealed but may be pickled, blasted or can be passivated.
Repair by welding. Permitted on <−20% of the weld seam length of
welded stainless steel tube if >−NPS 6 and having a wall
thickness >−0.200 in (mm). Tungsten-arc welding process is used
for repairs, with filler metal to a grade as specified in A 312
(not repeated here). Weld repairs must be identified on the pipe
and in test certificate.
Pipe Specifications - ASTM A312/A312M: Seamless and welded
austenitic stainless steel pipes.
This specification covers austenitic steel pipe intended for high
temperature and general corrosive service.
H grades in the chemical composition table are specifically for
high temperature service.
Spezilla supplies welded stainless steel tube per ASTM A312 or
ASTM A358 as well as rolled and welded. We supply common grades of
stainless steel such as 304, 304L, 316, and 316L in standard pipe
sizes and schedules, including Sch 5, Sch 10, Sch 40s and Sch 80s.
We also cater to less common stainless welded pipe requirements
with grades like 304H, 316H, 309S, 310S, 317L, 321H, 347H, 410, and
410S, in addition to Duplex and Nickel Alloy grades.
1. Heat Exchangers, Condensers & Pressure Vessels
2. Chemical & Petrochemical
3. Gas Industry
4. Power Generation
5. Pressure Vessels
6. Marine Equipments
7. Food & Beverage Processing
9. Pulp & Paper
Specification Tolerances for ASTM A312 / ASME SA312:
|Grade||UNS Designation||Tensile Strength, min ksi [Mpa]||Yield Strength, min ksi [Mpa]|
|TP304||S30400||75 ||30 |
|TP304L||S30403||70 ||25 |
|TP304H||S30409||75 ||30 |
|TP316||S31600||75 ||30 |
|TP316L||S31603||70 ||25 |
|TP316H||S31609||75 ||30 |
|TP310S||S31008||75 ||30 |
|TP310H||S31009||75 ||30 |
|TP321||S32100||75 ||30 |
|TP321H||S32109||75 ||30 |
|TP347||S34700||75 ||30 |
|TP347H||S34709||75 ||30 |
AS-WELDED SPECIFICATIONS ASTM A778 TOLERANCES, INCHES
|1/8 to 1-1/2||1/64||1/32||+4.5% to|
|Over 1-1/2 to 4||1/32||1/32|
|Over 4 to 8||1/16||1/32|
|Over 8 to 18||3/32|