GB-T14976 0Cr18Ni9 Stainless Steel Seamless Pipe

GB-T14976 0Cr18Ni9 Stainless Steel Seamless Pipe Used in mechanical structures, fluid pipes, boiler superheaters, heat exchangers, condensers, catalytic tubes, etc.

Description

GB-T14976 0Cr18Ni9 Stainless Steel Seamless Pipe
Standard:GB-T14976 
GB-T14976 0Cr18Ni9 steel pipe  applies to stainless steel seamless pipe for fluid transportation
Manufacture
Steel pipes are divided into two categories according to product processing methods.
The categories and codes are: hot rolled steel pipes (WH) and cold drawn steel pipes (WC).
Chemical composition of GB-T14976 0Cr18Ni9
Standard

Grade

Chemical composition

C

Si

Mn

P

S

Ni

Cr

≤

GB/T14976

0Cr18Ni9

0.07

1.00

2.00

0.035

0.30

8.00～11.00

17.00～19.00

Mechanical properties of GB-T14976 0Cr18Ni9

Standard Grade Tensile strength(MPa) Yield Strength(MPa) Elongation(%)
≥

GB/T14976

0Cr18Ni9

520

205

35
Dimension tolerance
Outer diameter and wall thickness tolerance of GB-T14976 0Cr18Ni9 Stainless Steel Seamless Pipe
 Hot rolled steel pipe  Cold drawn steel pipe
 Size/mm Tolerance /mm Size /mm  Tolerance  /mm
 PA  PC  PA  PC
OD 68 ≤ OD ≤ 159 ± 1.25 ± 1 OD 6 ≤ OD < 10 ± 0.20 ± 0.15
10 ≤ OD ≤ 30 ± 0.30 ± 0.20
159± 1.530± 0.40± 0.30
OD>5 ± 0.9% 0.8%
±WT  <15 +15
-12.5		 ± 12.5 WT ≤ 3 ± 14% +12%
-10%
≥ 15 +20
-15		 >3 +12%
-10%		 ± 10%
Tip shape
The end faces of the steel pipe should be perpendicular to the axis of the steel pipe and the burrs are removed.
Items of Testing
Hydraulic test:
The steel pipe shall be hydraulically tested one by one.
Flattening test:
Steel tubes with a wall thickness of not more than 10 mm shall be subjected to a flattening test
Flaring test:
A steel pipe having a wall thickness of less than or equal to 10 mm can be subjected to a flare test.
Intergranular corrosion test:
Austenitic and austenitic-ferritic steel tubes can be tested for intergranular corrosion.