JIS G 3445 STKM 11 A STKM 12 B STKM 13 C STKM 14 B Tube

JIS G 3445 is a Japanese Industrial Standard for Carbon Steel Tubes for Machine Structural Purposes. The materials of this standard are used for machinery, automobiles, bicycles, furniture, appliances and other machine parts. Dingxin has around 20 years of manufacturing STKM 11A pipe and STKM 13C tube. STKM 11A is low carbon steel with carbon content below 12% and STKM 13C is low carbon steel with maximum carbon content of 25%.

 

Product name	JIS G 3445 STKM 11 A STKM 12 B STKM 13 C STKM 14 B tube
Standard	JIS G 3445
Material	STKM 11 A, STKM 12 B, STKM 13 C, STKM 14 B
Dimension	OD: 16-245mm, WT1-32mm, Length: 3-6m
Certificate	ISO 9001, IATF 16949
Applications	Automotive industry and motorcycle industry
Packaging	Long pipe: hexagonal bundles with steel-hooped.

 

Steel Grade	C %	Si %	Mn %	P %	S %
STKM 11 A	≤0.12	≤0.35	≤0.60	≤0.040	≤0.040
STKM 12 A	≤0.20	≤0.35	≤0.60	≤0.040	≤0.040
STKM 12 B
STKM 12 C
STKM 13 A	≤0.25	≤0.35	0.30~0.90	≤0.040	≤0.040
STKM 13 B
STKM 13 C
STKM 14 A	≤0.30	≤0.35	0.30~1.00	≤0.040	≤0.040
STKM 14 B
STKM 14 C
STKM 15 A	0.25~0.35	≤0.35	0.30~1.00	≤0.040	≤0.040
STKM 15 C
STKM 16 A	0.35~0.45	≤0.40	0.40~1.00	≤0.040	≤0.040
STMK 16 C
STKM 17 A	0.45~0.55	≤0.40	0.40~1.00	≤0.040	≤0.040
STKM 17 C
STKM 18 A	≤0.18	≤0.55	≤1.50	≤0.040	≤0.040
STKM 18 B
STKM 18 C
STKM 19 A	≤0.25	≤0.55	≤1.50	≤0.040	≤0.040
STKM 19 C
STKM 20 A	≤0.25	≤0.55	≤1.60	≤0.040	≤0.040

 

Steel Grade	Tensile Strength (Mpa)	Yield Strength (Mpa)	Elongation (%)
STKM 11 A	≥290	NA	≥35
STKM 12 A	≥340	≥175	≥35
STKM 12 B	≥390	≥275	≥25
STKM 12 C	≥470	≥355	≥20
STKM 13 A	≥370	≥215	≥30
STKM 13 B	≥440	≥305	≥20
STKM 13 C	≥510	≥380	≥15
STKM 14 A	≥410	≥245	≥25
STKM 14 B	≥500	≥355	≥15
STKM 14 C	≥550	≥410	≥15
STKM 15 A	≥470	≥275	≥22
STKM 15 C	≥580	≥430	≥12
STKM 16 A	≥510	≥325	≥20
STMK 16 C	≥620	≥460	≥12
STKM 17 A	≥550	≥345	≥20
STKM 17 C	≥650	≥480	≥10
STKM 18 A	≥440	≥275	≥25
STKM 18 B	≥490	≥315	≥23
STKM 18 C	≥510	≥380	≥15
STKM 19 A	≥490	≥315	≥23
STKM 19 C	≥550	≥410	≥15
STKM 20 A	≥540	≥390	≥23

 

● Adopt raw materials from leading mills in China

● Outer diameter and inner diameter with high precision in tolerance

● Smooth drawn surface

● Excellent mechanical properties facilitating bending and flaring for following processing procedures

 

● We strictly control the tolerances for outer diameter and wall thickness and make sure the concentricity is within 5% of the wall thickness.

● NDT (non-destructive testing) applied to 100% of the pipes to avoid surface defects and sub-surface cracks.

● Test certificates verifying grade, chemistry and mechanical properties are available with all products.

 

1. Q: Are you a trading company or manufacturer?

      A: Dingxin is a profession steel tube manufacturer locating in Jiaxing City, Zhejiang Province.

 

2. Q: How long is your delivery time?

      A: Generally it takes 30-40 days to manufacture the pipes after reaching agreement on the technical issues.

 

3. Q: What is your terms of payment?

      A: 30% advance payment, 70% balance against B/L copy or Letter of Credit at sight.

 

4. Q: How about your MOQ?

      A: Normally the MOQ is 3 tons. You can contact us to see whether we have stock for a particular size.

 

 

Why choose us?

• Our team of professionals understands the unique needs of the automotive industry and can offer tailored solutions.
• By continually improving the specifications and level of our products, we can guarantee the stability of our JIS G 3445 STKM 11 A STKM 12 B STKM 13 C STKM 14 B Tube.
• We are committed to ensuring our clients are satisfied with every aspect of our service and product.
• We believe that industry is the most valuable asset of an enterprise, and shareholders are the founders of the enterprise and the driving force of sustainable operation.
• Our Automotive Tubes are manufactured using advanced technology and materials, ensuring they exceed industry standards.
• We uphold the concepts of innovation, quality, service, and integrity, and also pay attention to product quality and after-sales.
• We pride ourselves on our ability to deliver high-quality Automotive Tube products that meet or exceed industry standards.
• Our company increases the strength of scientific and technological innovation, promotes the improvement and improvement of product quality by technological progress, and enhances the awareness of JIS G 3445 STKM 11 A STKM 12 B STKM 13 C STKM 14 B Tube quality management.
• Our products are manufactured in accordance with the highest industry standards and regulations.
• In recent years, our staff with the unremitting pursuit of professionalism and quality service awareness has made great progress.

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