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Product

JIS G3445 STKM11A STKM12B STKM13B Seamless Steel Tube

JIS G3445 Carbon Seamless Steel Tubes STKM11A 12A 13B tubes

Standard: 

JIS G3445 Carbon Seamless steel tubes


Product Detail

Product Tags

Features

Material Grade:

STKM 11A 12A 12B 12C 13A 13B 13C 14A 14B 14C 15A 15C etc.

Surface Treatment:

1.Bared

2.Black Painted (varnish coating)

3.Galvanized

4.Oiled

5.According to customers.

JIS G3445 Precision steel tubes are mainly used in automobile and precision machinery parts for cars and cylinder. pressure use, and also for transporting steam, water, gas pipe lines.

Chemical composition

Grade Designation Unit (%)
C Si Mn P S Nb or V
Grade 11 A STKM 11A 0.12 max. 0.35 max. 0.60 max. 0.040 max. 0.040 max. -
Grade 12 A STKM 12A 0.20 max. 0.35 max. 0.6 max. 0.04 max. 0.04 max.  
B STKM 12B
C STKM 12C
Grade 13 A STKM 13A 0.25 max. 0.35 max. 0.30~0.90 0.040 max. 0.040 max. -
B STKM 13B
C STKM 13C
Grade 14 A STKM 14A 0.30 max. 0.35 max. 0.30~1.00 0.040 max. 0.040 max. -
B STKM 14B
C STKM 14C
Grade 15 A STKM 15A 0.25~0.35 0.35 max. 0.30~1.00 0.040 max. 0.040 max. -
C STKM 15C
Grade 16 A STKM 16A 0.35~0.45 0.40 max. 0.40~1.00 0.040 max. 0.040 max. -
C STKM 16C
Grade 17 A STKM 17A 0.45~0.55 0.40 max. 0.40~1.00 0.040 max. 0.040 max. -
C STKM 17C
Grade 18 A STKM 18A 0.18 max. 0.55 max. 1.50 max. 0.040 max. 0.040 max. -
B STKM 18B
C STKM 18C
Grade 19 A STKM 19A 0.25 max. 0.55 max. 1.50 max. 0.040 max. 0.040 max. -
C STKM 19C
Grade 20 A STKM 20A 0.25 max. 0.55 max. 1.60 max. 0.040 max. 0.040 max. 0.15 max

Mechanical properties

 Steel Grade

Yield Strength (Mpa) Tensile Strength (Mpa) Elongation(%)

Name

No.

ReH (min) Rm(min)

A(min)

STKM 11A

 

_

290

35

STKM 12A

 

175

340

35

STKM 12B

 

275

390

25

STKM 12C

 

355

4700

20

STKM13A

 

215

370

30

STKM 11B

 

305

440

20

STKM11C

 

380

510

15

Tolerance

SIZE Allowable tolerance Special Tolerance
OD WT OD WT
4mm-20mm ±0.25mm <3mm±0.3mm;

 

≥3mm

±10%

 

±0.05mm ±0.05mm
20mm-30mm ±0.25mm ±0.08mm ±0.08mm
31mm-40mm ±0.25mm ±0.10mm ±0.08mm
41mm-49mm ±0.25mm ±0.15mm ±0.15mm
50mm-80mm ±0.5% ±0.20mm ±0.20mm
81mm-120mm ±0.5% ±0.30mm ±0.30mm

Delivery condition

Designation Symbol Description
Cold finished (hard) BK(+C) 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)
(+LC)
Cold finished and stress-relieved BKS(+SR) 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(+A) The last Cold forming process is followed by annealing in a controlled atmosphere.
Normalized NBK(+N) The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere.
High Precision Steel Tubes in Stock
OD Thickness(mm)
mm
4 4*1                  
6 6*1 6*1.5 6*2              
8 8*1 8*1.5 8*2              
10 10*1 10*1.5 10*2 10*2.5            
12 12*1 12*1.5 12*2 12*2.5 12*3          
14 14*1 14*1.5 14*2 14*2.5 14*3          
15 15*1 15*1.5 15*2 15*2.5 15*3 15*3.5        
16 16*1 16*1.5 16*2 16*2.5 16*3 16*3.5 16*4 16*4.5    
18 18*1 18*1.5 18*2 18*2.5 18*3 18*3.5 18*4 18*4.5    
20 20*1 20*1.5 20*2 20*2.5 20*3 20*3.5 20*4 20*4.5 20*5  
22 22*1 22*1.5 22*2 22*2.5 22*3 22*3.5 22*4 22*4.5 22*5  
25 25*1 25*1.5 25*2 25*2.5 25*3 25*3.5 25*4 25*4.5 25*5  
28 28*1 28*1.5 28*2 28*2.5 28*3 28*3.5 28*4 28*4.5 28*5  
30 30*1 30*1.5 30*2 30*2.5 30*3 30*3.5 30*4 30*4.5 30*5 30*6
32   32*1.5 32*2 32*2.5 32*3 32*3.5 32*4 32*4.5 32*5 32*6
34   34*1.5 34*2 34*2.5 34*3 34*3.5 34*4 34*4.5 34*5 34*6
35   35*1.5 35*2 35*2.5 35*3 35*3.5 35*4 35*4.5 35*5 35*6
38     38*2 38*2.5 38*3 38*3.5 38*4 38*4.5 38*5 38*6
40     40*2 40*2.5 40*3 40*3.5 40*4 40*4.5 40*5 40*6
42     42*2 42*2.5 42*3 42*3.5 42*4 42*4.5 42*5 42*6
45     45*2 45*2.5 45*3 45*3.5 45*4 45*4.5 45*5 45*6
46     46*2 46*2.5 46*3 46*3.5 46*4 46*4.5 46*5 46*6
48     48*2 48*2.5 48*3 48*3.5 48*4 48*4.5 48*5 48*6
50     50*2 50*2.5 50*3 50*3.5 50*4 50*4.5 50*5 50*6
54       54*2.5 54*3 54*3.5 54*4 54*4.5 54*5 54*6
60       60*2.5 60*3 60*3.5 60*4 60*4.5 60*5 60*6
65         65*3 65*3.5 65*4 65*4.5 65*5 65*6
75           75*3.5 75*4 75*4.5 75*5 75*6
76             76*4 76*4.5 76*5 76*6
89                   89*6
Note: We could produce other sizes as your requirements.       Surface Treatment: Bright, Galvanized, Phosphate etc.

Manufacture Process

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Advantages

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Strengthen the inspection of products in each production stage, equipped with complete testing equipment:  non-destructive eddy current testing, high pressure resistance testing machine, universal mechanical tensile testing machine, bending flattening flares testing machine, cleanliness analyzer, metal element analyzer, etc. Meet the mechanical properties of products, process performance test, provide a powerful guarantee for qualified products .

Quality assurance

1. Strict according to JIS G3445 Standard or other standards.

2. Sample: Sample is free for test.

3. Tests: Salt spray test/Tensile test / Eddy current / Chemical composition test according to customers' request

4.Certificate: IATF16949, ISO9001, SGS etc.

5.EN 10204 3.1 Certification


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