JIS G3459 SUS321 Stainless Steel Pipe

SUS321 is One of the steel grades in JIS G3459 standard..JIS G3459 Standard specifies the stainless steel pipes used for the pipings for corrosion resistance, low temperature sevice, high temperature service, etc.

Description

JIS G3459 SUS321 Stainless Steel Pipe Dimensional Range & Specification
Outside Diameter：12.7mm——219mm
Wall thickness：3.0mm——12.7mm
Length：6000mm、12000m or specified length as required.
Scope
JIS G3459 Standard specifies the stainless steel pipes (hereafter referred tp as “pipes”) used for the pipings for corrosion resistance, low temperature sevice, high temperature service, etc.
SUS321 is One of the steel grades in JIS G3459 standard.
Method of manufacture
Pipes shall be manufactured by a seamless process, an automatic arc welding process, a laser welding process, or an electric resistance welding process.
Heat treatment of JIS G3459 SUS321
Classification Grade Solution treatment ℃
Austenitic pipes SUS 321TP 920 min, rapid cooling
Chemical composition of JIS G3459 SUS321
 Grades Chemical composition
SUS 321 C Si     Mn P S Ni Cr Mo Others
0.08 max. 1.00 max. 2.00 max. 0.040 max. 0.030 max. 9.00~13.00 17.00~19.00 — Ti 5】C% min.
Mechanical properties of JIS G3459 SUS321
Grade
 Mechanical properties
Tensile strength Yield Strength Elongation %
kgf/mm 2  {N/mm2} kgf/mm 2  {N/mm2}
No. 11 test piece
No. 12 test piece
 No.5 test piece No.4 test piece
Longitudinal direction Transverse direction Longitudinal direction Transverse direction
SUS 321 53{520}min. 21{206} min 35 min 25 min 30 min 22 min
Dimensional tolerances
The tolerances on outside diameter, wall thickness, and eccentricity of pipe

Tolerances on outside diameter, wall thickness and eccentricity

Division Tolerances on outside diameter Tolerances on wall thickness Tolerances on eccentricity
ot-finished seamless pipe Under 50mm 【0.5mm Under 4mm 【0.5mm
At most 20 % of wall
thickness
50mm or over 【1% 4mm or over 【12.5%
Cold-finished seamless pipe, automatic arc welded pipe,
electric resistance welded pipe, and laser welded pipe
 Under 30mm 【0.3mm Under 2mm 【0.2mm —
30mm or over 【1% 2mm or over 【10%
Remarks
The eccentricity means the ratio of the difference between maximum and minimum wall thickness measured in the same section to the specified wall thickness, and this shall not be applied to pipes under 5.6mm in wall thickness..
As for the portions locally ground or the like, the above tolerance on outside diameter shall not be applied if it is confirmed that the wall thickness is within the tolerance range given in the above table.