Product Name: JIS G3445 STKM11A STKM12A STKM13A
Precision Carbon Steel Tubes for Machine Structural Purposes
Material: STKM11A, STKM12(ABC), STKM13(ABC)
Size Range: OD: 6-88mm, WT: 1-15mm, Length: 5.8m/6m, maximal 11.8m
Quality Control:
1. Incoming Raw Material Inspection
2. Raw Material Segregation to avoid steel grade mix-up
3. Heating and Hammering End for Cold Drawing
4. Cold Drawing or Cold Rolling, On line inspection
5. Heat Treatment:BKS, GBK, NBK
6. Straightening/Cutting to specified length/Finished Measuring Inspection
7. Quality Testing in own lab with Tensile Strength, Yield Strength, Elongation, Hardness, Straightness, etc.
8. Packing and Stocking.
100% Eddy Current Testing.
100% Size Tolerance Checking.
100% Tube surface checking to avoid surface defects.
Product Name | JIS G3445 Precision Carbon Steel Tubes for Machine Structural Purposes |
Material | STKM11A, STKM12(ABC), STKM13(ABC) |
Delivery Condition | HR,CW,SR,A,N |
Standard | JIS G3445 |
Size Range | OD: 6-88mm, WT: 1-15mm |
Application | Machine Structural Purposes |
Round Billet | Bao Steel, Xingcheng Steel, Huai Steel, Zhongtian Steel |
Keyword | JIS G3445 |
Certificate | TS16949, ISO 9001 |
HS code | 7304319000 |
Delivery Time | 45 days |
Packing | Bundles or Wooden Boxes |
CHEMICAL COMPOSITION unit:% max | |||||
Steel Grade | C | S | Mn | P | S |
STKM 11A | 0.12 | 0.35 | 0.60 | 0.040 | 0.040 |
STKM 12A | 0.20 | 0.35 | 0.60 | 0.040 | 0.040 |
STKM 12B | |||||
STKM 12C | |||||
STKM 13A | 0.25 | 0.35 | 0.30-0.90 | 0.040 | 0.040 |
STKM 13B | |||||
STKM 13C | |||||
STKM 14A | 0.30 | 0.35 | 0.30-1.00 | 0.040 | 0.040 |
STKM 14B | |||||
STKM 14C | |||||
STKM 15A | 0.25-0.35 | 0.35 | 0.30-1.00 | 0.040 | 0.040 |
STKM 15C | |||||
STKM 16A | 0.35-0.45 | 0.40 | 0.40-1.00 | 0.040 | 0.040 |
STKM 16C | |||||
STKM 17A | 0.45-0.55 | 0.40 | 0.40-1.00 | 0.400 | 0.040 |
STKM 17C | |||||
STKM 18A | 0.18 | 0.55 | 1.50 | 0.040 | 0.040 |
STKM 18B | |||||
STKM 18C | |||||
STKM 19A | 0.25 | 0.55 | 1.50 | 0.040 | 0.040 |
STKM 19C | |||||
STKM 20A | 0.25 | 0.55 | 1.60 | 0.040 | 0.040 |
MECHANICAL PROPERTIES | |||
Steel Grade |
Tensile strength Mpa min |
Yield strength Mpa min |
Elogation% min |
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 |
STKM 14A | 410 | 245 | 25 |
STKM 14B | 500 | 355 | 15 |
STKM 14C | 550 | 410 | 15 |
STKM 15A | 470 | 275 | 22 |
STKM 15C | 580 | 430 | 12 |
STKM 16A | 510 | 325 | 20 |
STKM 16C | 620 | 460 | 12 |
STKM 17A | 550 | 345 | 20 |
STKM 17C | 650 | 480 | 10 |
STKM 18A | 440 | 275 | 25 |
STKM 18B | 490 | 315 | 23 |
STKM 18C | 510 | 380 | 15 |
STKM 19A | 490 | 315 | 23 |
STKM 19C | 550 | 410 | 15 |
STKM 20A | 540 | 390 | 23 |
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