JIS3445 Heat Exchanger Steel Tube STKM13A Precision Cold Drawn Seamless Stainless Steel Tube

Standard

Steel Grade

Tensile Strength (MPa)

Yield Point (MPa)

Elongation(%)

JIS G3445

STKM13A

≥375

≥215

≥30

STKM13B

≥440

≥305

≥20

Pipe Tolerance Table

Name

Rang(mm)

German Standard(mm)

Corporate Internal Control Standards(mm)

Special High-Precision(mm)

Outer Diameter

4-30

±0.08

±0.05

±0.03

31-40

±0.15

±0.05

±0.03

41-50

±0.20

±0.08

±0.03

51-60

±0.25

±0.08

±0.03

Wall thickness

0.5-7

±10%

±10%, Min±0.05

±10%, Min±0.03

Length

+/-10mm

Automotive industry pipe length can be cut according to customer requirements.

Heat treatment process delivery conditions:

Delivery Condition

Heat Treatment Process

+C

Cold drawn / hard. After the final cold forming no heat treatment.

+LC

Cold drawn/soft. After the final heat treatment-limiting deformation, cold drawn, allowing a degree of cold deformation

+SR

Steel heat treatment is applied after the last cold deformation process, the result of state steel after due process, the residual stress deformation and machining makes a certain degree of difficulty increases.

+A

In the final step of the steel pipe after cold deformation, placed in a controlled atmosphere furnace for annealing.

+N

In the final step of the steel pipe after cold deformation, placed in a controlled atmosphere furnace at a temperature above the phase transition point to continue annealing.