STKM 11A, STKM12ABC,STKM13ABC,STKM 14ABC

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Product Information

JIS G3445  STKM 11A, STKM12ABC,STKM13ABC,STKM 14ABC

Carbon steel tubes for machine structural purposes

Application

Machinery, Automobiles, Bicycles,Furniture, Appliances and Other machine parts.

Size Range

O.D 12.7-110mm
W.T 1.2-14mm

Length: 3-12M or according to your requirements



Standard

  Grade

Chemical  Composition%

C

Mn

P

S

Si

JIS G3445

STKM 11A

≤0.12

≤0.60

≤0.04

≤0.04

≤0.35

STKM 12A

≤0.20

≤0.60

≤0.04

≤0.04

≤0.35

STKM 12B

≤0.20

≤0.60

≤0.04

≤0.04

≤0.35

STKM 12C

≤0.20

≤0.60

≤0.04

≤0.04

≤0.35

STKM 13A

≤0.25

0.3~0.9

≤0.04

≤0.04

≤0.35

STKM 13B

≤0.25

0.3~0.9

≤0.04

≤0.04

≤0.35

STKM 13C

≤0.25

0.3~0.9

≤0.04

≤0.04

≤0.35

Standard

  Grade

Mechanical Properties

Tensile Strength(Mpa)

Yield Strength(Mpa)

Elongation(%)

JIS G3445

STKM 11A

≥290

-

≥35

STKM 12A

≥340

≥175

≥35

STKM 12B

≥390

≥275

≥25

STKM 12C

≥470

≥355

≥20

STKM 13A

≥370

≥215

≥30

STKM 13B

≥440

≥305

≥20

STKM 13C

≥510

≥380

≥15

Delivery Condition


Designation

Symbol

Description

Cold finished (hard)

BK

Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformation.

Cold finished (soft)

BKW

The final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming (e.g. bending, expanding).

Cold finished and stress-relieved

BKS

Heat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree.

Annealed

GBK

The last cold forming process is followed by annealing in a controlled atmosphere.

Normalized

NBK

The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere.


Inspections and tests performed

Chemical Composition,Mechanical Properties,Visual appearance and dimensions Test,NDT,Grain Size Test.


Surface treatment

Oil-dip,varnish,Shot Blasting

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