ASTM A312 TP321 Stainless Steel Seamless Pipe


ASTM A312 TP321 Stainless Seamless Steel Pipe
ASTM A312 TP321 Steel Pipe for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
A312 TP321 is a brand of the ASTM A312 Standard.
ASTM A312 TP321 Stainless Steel Pipe Dimensional Range & Specification
Outside Diameter :16-228mm
Wall thickness:0.4mm——30mm
Length:6000mm、12000m or specified length as required.
ASTM A312 TP321 Stainless Steel  Pipe Chemical Composition(%)
A312 Grade UNS C Mn P S Si Cr Ni N
TP321 S3210 ≤0.08 ≤2.00 ≤0.045 ≤0.030 ≤1.00 17.0-19.0 9.0-12.0 ≤0.10
ASTM A312 TP321 Stainless Steel  Pipe Mechanical & Physical Properties
A312 Grade Heat Treatment Temperure Min.℉(℃) Tensile Strength Ksi(MPa) Yield Strength Ksi(MPa) Elongation
TP321 Solution 1900(1040) ≥75(515) ≥30(205) ≥35
Surface Condition
Pickling or shot blasting, Passivated, Black Phosphating.
Tests and Inspection Of ASTM A312 TP321 Stainless Steel  Pipe
Flattening Test,Flaring Test,Hardness Test,Hydrostatic or Nondestruction Electric Test ( Eddy Current and Ultrasonic Testing)
1.100% PMI,Spectro Chemical Aanlysis Test for Raw Material
2.100% Dimension & Visual Examination
3. Mechanical Properties Test Include Tension Test,Flaring Test (For Seamless tube/pipe)/ Flange Test (For Welded Pipe & Tube), Hardness Test ,Reversed Flattening Test, Transverse-guided face bend test
4.100% Hydrostatic Test or 100% NON-DESTRUCTIVE Test  (ET or UT)
5.Radiographic Test for Welded Pipe (shall be accordance with specification,or shall be as agreed upon between the purchaser and vendor)
6.Straightness Test  (optional)
7.Roughness Test (optional)
8.Intergranular Corrosion Test(optional)
9.Impact Test (optional)
10.Grain Size Determinations (optional)
Tolerance for ASTM A312 TP321 Stainless Steel  Pipe

Outside Diamete Tolerance of ASTM A312 TP321 Stainless Steel  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 Stainless Steel  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

Our Dervice Of ASTM A312 TP321 Stainless Steel  Pipe

  • 1.The length of the pipe can be either standard or customized
  • 2.Plain end or beveled end can be made as customers’ requirements plastic caps will be used to protect the pipe from damage and dust.
  • 3.If you requirements call for custom coatings or special surface preparation,just let us know.
  • 4.Beite steel pipe’ stainless steel pipe inventory includes many hard-to-find size and grades as well as all common stainless steel pipe grades and size.

ASTM A312 TP321 Stainless Steel  Pipe Packaging & Delivery

Types of Packaging:
– Bundles (hexagonal)
– Wooden Boxes
– Crates (steel/wooden)
– Special crates for U-Bend tubes with each radius separated
– Our ASTM A312 TP321 Stainless Steel Pipe packing can meet any needs of the customers.