STKM11A Seamless Steel Tube 30-325mm OD 2-100mm Thick for Auto Parts
Rincian produk
seamless steel tube for auto parts
,precision steel tube 30-325mm OD
,steel tube 2-100mm thick
STKM11A Heavy Thick-Wall Precision Seamless Steel Tubing — Technical Product Description
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
Here is a table showing STKM11A and 4 other related STKM grades (used in similar applications) with their chemical composition limits under JIS G 3445.
| 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
Below is a table showing mechanical property minima for STKM11A and four other related grades from JIS G 3445, useful for heavy thick-wall applications such as automotive components.
| 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
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<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.
-
Auto Parts ASTM A513 Cold Rolling Tabung Baja Dilas dengan Produksi DOM
Bagian Otomotif ASTM A513 tabung baja las dengan produksi DOM ASTM A513 Tabung mekanik karbon dan baja paduan yang dilas dengan resistensi listrik Aplikasi: untuk Mesin, Teknik Mesin 1Standar:ASTM A513 tabung baja presisi las bergelombang dingin 2Kelas baja:SAE1010, SAE1020, bahan lain setelah ... -
25mm Diameter Bright Annealing Tabung Baja Mulus untuk Sistem Hidrolik
EN10305-1 E235 E355 NBK Pipa baja presisi pemutih terang untuk sistem hidrolik EN10305-1 NBK pipa baja presisi Bright Annealed untuk sistem hidrolik OD:4-80 (mm) WT0.5-10 (mm) Panjang 1000-12000mm Nama produk: Pipa Baja Precision Seamless Aplikasi: untuk sistem hidrolik pipa baja presisi untuk ... -
Tabung Baja Hitam Fosfat Seamless Presisi untuk Sistem Hidraulik
Pipa baja dengan presisi tinggi untuk sistem hidrolik dengan permukaan Phosphating Hitam Tabung hidraulik fosfat hitam dengan presisi tinggi dan toleransi yang ketat, tabung diproduksi oleh presisi dingin ditarik dan rolling dingin, kemudian terang annealed dalam atmosfer yang dilindungi,Setelah itu ... -
Tabung Baja Galvanis Mulus Presisi DIN2391 EN103052 ST35.0 ST37
Precision Seamless Galvanized Steel Tubes DIN2391 EN103052 ST35.0 ST37 Proses Produksi: Gelas dingin oleh mesin Cold pilger dan mesin Cold rolling,galvanized dan zinc plated dapat diterapkan. Pipa baja yang digulung dingin dan galvanis Proses produksi:Tabung baja tanpa jahitan DIN yang sangat akurat...
