ASTM A312 is a standard specification for seamless, welded, and heavily cold worked austenitic stainless steel pipes used in high-temperature and general corrosive service. TP321 is a specific grade of stainless steel, which is also known as 321 stainless steel. Here are the specifications for ASTM A312 TP321 stainless steel seamless pipes.
ASTM A321 SS Seamless Pipes Specification:
|
Specifications |
: |
ASTM A312 / SA 312 |
|
Dimensions |
: |
ASTM, ASME and API |
|
Size |
: |
1/8″NB TO 30″NB IN |
|
Seamless 321 Pipes |
: |
1/2" NB - 16" NB |
|
Schedule |
: |
SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS |
|
Type |
: |
ASTM A 312 TP 321 Seamless Pipes |
|
Specialized in |
: |
Large Diameter Size |
|
Length |
: |
Single Random, Double Random & Cut Length. |
|
Form |
: |
Round, Square, Rectangular, Hydraulic Etc |
|
End |
: |
Plain End, Beveled End,Threaded |
Tolerance for ASTM A312 TP321 SS Seamless Pipe:
- Outside Diameter Tolerance of ASTM A312 TP321 SS Seamless Pipe
|
NPS |
ASTM A312 TP321 OD Tolerance |
|||
|
+ |
– |
|||
|
inch |
mm |
inch |
mm |
|
|
1/8-1 1/2 |
1/64(0.015) |
0.4 |
1/32(0.031) |
0.8 |
|
＞1 1/2-4 |
1/32(0.031) |
0.8 |
1/32(0.031) |
0.8 |
|
＞4-8 |
1/16(0.062) |
1.6 |
1/32(0.031) |
0.8 |
|
＞8-18 |
3/32(0.093) |
2.4 |
1/32(0.031) |
0.8 |
|
＞18-26 |
1/8(0.125) |
3.2 |
1/32(0.031) |
0.8 |
|
＞26-34 |
5/32(0.156) |
4 |
1/32(0.031) |
0.8 |
|
＞34-48 |
3/16(0.187) |
4.8 |
1/32(0.031) |
0.8 |
- Wall Thickness Tolerance of ASTM A312 TP321 SS Seamless Pipe
|
NPS |
ASTM A312 TP321 WT Tolerance |
|
|
+ |
– |
|
|
1/8-2 1/2 |
20 |
12.5 |
|
3-18,T/D≤5% |
22.5 |
12.5 |
|
3-18，T/D＞5% |
15 |
12.5 |
|
≥20，welded |
17.5 |
12.5 |
|
≥20,seamless,T/D≤5% |
22.5 |
12.5 |
|
≥20,seamless,T/D＞5% |
15 |
12.5 |
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