STKM11A Carbon Steel Heavy Thick Wall Seamless Steel Tube JIS G 3445 Standard Precision Steel Pipe
Basic Properties
Place of Origin:
Zhejiang/China
Brand Name:
TORICH
Certification:
ISO9001 ISO 14001 TS16949
Model Number:
Heavy Thick Wall Steel Tubing
Trading Properties
Minimum Order Quantity:
1Ton
Price:
800-1000 USD/Ton
Payment Terms:
L/C,D/A,D/P,T/T,Western Union,MoneyGram
Supply Ability:
60000 Ton/Tons per Year
Product Summary
STKM11A Heavy Thick Wall Steel Tubing Precision Alloy Steel Seamless Pipe For Auto PartMaterial OverviewSTKM11A is a carbon (mild) steel grade under the JIS G 3445 standard, specified for seamless steel tubes used in machine structural applications. It is used for heavy thick-wall tubing in ...
Product Details
Highlight:
seamless steel tube for auto parts
,precision steel tube 30-325mm OD
,steel tube 2-100mm thick
Outer Diameter(Round):
30 - 325 Mm,
Standard:
ASTM,DIN,GB,JIS,API
Technique:
Cold Drawn,Hot Rolled,Cold Rolled,ERW,Hot Rolled/Cold Drawn
Product Description
STKM11A Heavy Thick Wall Steel Tubing Precision Alloy Steel Seamless Pipe For Auto Part
Material Overview
STKM11A is a carbon (mild) steel grade under the JIS G 3445 standard, specified for seamless steel tubes used in machine structural applications. It is used for heavy thick-wall tubing in automotive parts and other mechanical components where strength, formability, and consistency are required.
Specifications
| Parameter | Detail |
|---|---|
| Standard | JIS G 3445: Carbon steel tubes for machine structural purposes |
| Form | Seamless steel tubing (also hot-rolled or cold drawn depending on required precision) |
| Dimensions (Typical) | Outer Diameter (OD): ~6 mm to ~340 mm; Wall Thickness (WT): ~1 mm to ~50 mm |
| Delivery Conditions | Bright annealed or otherwise heat treated per JIS G3445; tolerances on OD and wall thickness per the standard |
Chemical Composition: Comparison Among Similar STKM Grades
Chemical composition limits under JIS G 3445 for STKM11A and related grades:
| Grade | C (max) | Si (max) | Mn (max or range) | P (max) | S (max) |
|---|---|---|---|---|---|
| STKM11A | 0.12 % | 0.35 % | 0.60 % | 0.040 % | 0.040 % |
| STKM12A | 0.20 % | 0.35 % | 0.60 % | 0.040 % | 0.040 % |
| STKM13A | 0.25 % | 0.35 % | 0.30-0.90 % | 0.040 % | 0.040 % |
| STKM13C | ~0.25 % | 0.35 % | 0.30-0.90 % | 0.040 % | 0.040 % |
| STKM14A | 0.30 % | 0.35 % | 0.30-1.00 % | 0.040 % | 0.040 % |
Mechanical Properties
Mechanical property minima for STKM11A and related grades from JIS G 3445:
| Grade | Tensile Strength (min) MPa | Yield/Proof Stress (min) MPa | Elongation (min) % | Notes on Formability / Bend / Flattening |
|---|---|---|---|---|
| STKM11A | 290 MPa | -- (some sources specify proof stress ~ not always declared) | 35 % | Must pass flattening test (half diameter), specific bend tests, straightness etc. |
| STKM12A | 340 MPa | 175 MPa | 35 % | Bend tests: 90° etc. |
| STKM13A | 370 MPa | 215 MPa | 30 % | More demanding flattening, bend radius, etc. |
| STKM13C | 510 MPa | 380 MPa | 15 % | Lower elongation but higher strength; suited where higher load, less deformation acceptable |
| STKM14A | 410 MPa | 245 MPa | 25 % | Intermediate grade between STKM13 and STKM15 in strength vs ductility |
Key Features
- Low Carbon Content - Good formability, weldability, machinability. STKM11A's carbon ≤ 0.12 % makes it relatively mild steel
- Good Ductility and Elongation - High elongation (≥ 35 %) allows forming, bending, and deformation without cracking, which is useful in automotive parts where bending or shaping is needed
- Adequate Strength for general machine structural parts: tensile ≥ ~290 MPa. Enough for many auto part uses where ultra high strength isn't necessary
- Uniformity and Precision - Being seamless (no welds), tight tolerances on OD and wall thickness, straightness, surface finish. Useful when assembly, sliding fit, or sealing involved
- Cost-Effective compared to higher alloys or heat-treated steels. Mild steel grades like STKM11A tend to be less expensive and easier to produce
Standard / Execution Requirements
- Standard: JIS G 3445 - Carbon steel tubes for machine structural purposes
- Dimensional Tolerances: Outside diameter and wall thickness tolerances per divisions defined in JIS G 3445. For example, for OD under 50 mm, tolerance ±0.5 mm; for larger sizes, percentage-based
- Mechanical Property Testing: Tensile, elongation, flattening test (e.g., flatten without crack), bending test requirements (degree, radius) stipulated
- Appearance: Tubes must be practically straight; ends square to axis; surface free from defects detrimental to use
Application Fields
General Application Domains
- Automotive parts
- Machinery components
- Mechanical structures
- Hydraulic or pneumatic systems
- Furniture, appliances
Specific Uses within Automotive / Auto Parts
- Drive shafts and steering shafts (where strength + precise fit matters)
- Tubing for shock absorbers or suspension components (where wall thickness must withstand loads)
- Auto chassis sub-components requiring seamless tubing for durability under vibration
- Bushings, bearing housings, sleeve tubes where precise inner diameter and straightness are needed
Frequently Asked Questions
Q: Are you trading company or manufacturer?
A: Manufacturer, also can do trading.
Q: How long is your delivery time?
A: Generally speaking, it is 10-15 days if the goods are in stock, or it is 30-40 days if the goods are not in stock, it is according to quantity.
Q: Do you provide samples? Is it free or extra?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment?
A: Payment ≤ 2000 USD, 100% in advance. Payment ≥ 2000 USD, 30% T/T in advance, balance before shipment. If you have another question, please feel free to contact with me.
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