質 STKM11A Seamless Steel Tube 30-325mm OD 2-100mm Thick for Auto Parts 工場

STKM11A Seamless Steel Tube 30-325mm OD 2-100mm Thick for Auto Parts

Name: STKM11A Seamless Steel Tube 30-325mm OD 2-100mm Thick for Auto Parts
Brand: TORICH INTERNATIONAL LIMITED
SKU: 厚い壁の鋼鉄のチューブ
Price: 900.00 USD
Availability: InStock

基本プロパティ

原産地: Zhijiang/China

ブランド名: TORICH

認定: ISO9001 ISO 14001 TS16949

モデル番号: 厚い壁の鋼鉄のチューブ

取引物件

最低注文数量: 1ton

価格: 800-1000 USD/Ton

支払条件: L/C、D/A、D/P、T/T、Western Union、MoneyGram

供給能力: 年間60000トン/トン

タグ

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 ...

製品詳細

ハイライト:

seamless steel tube for auto parts

,

precision steel tube 30-325mm OD

,

steel tube 2-100mm thick

Application: 構造パイプ、油圧パイプ、建設、液体パイプ、オイルパイプ

Outer Diameter(Round): 30-325 mm、

Thickness: 2-100 mm、

Standard: ASTM、DIN、GB、JIS、API

Certification: API,CE,ISO,ISO9001-2008,ISO9001

Technique: 冷たい描画、熱い巻き、冷たい巻き、erw、ホットロール/コールドドロー

Grade: stkm11a 11b

Length: 6M または要求に応じて,顧客の要求に応じて,

製品説明

STKM11A Seamless Steel Tube 30-325mm OD 2-100mm Thick for Auto Parts 0

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

STKM11A Seamless Steel Tube 30-325mm OD 2-100mm Thick for Auto Parts 1