DIN 2391 ST 30 Seamless Precision Steel Tubes Manufacturer and Supplier in India
DIN 2391 ST 30 Seamless precision steel tubes are designed for use in places where there is a need for close dimensional tolerance and good surface finishes on the inside and outside surfaces, and mechanical properties of the metal. The material of this tubing is low-carbon steel according to DIN2391 and has good machinability and cold forming and welding properties. They come in various outside diameters and wall thicknesses, providing an even level of quality and performance under moderate-pressure situations. Amardeep Steel supplies and manufactures high-precision DIN 2391 ST 30 Seamless Precision Steel Tubes with quality control, competitive price and fast delivery to all countries.
Technical Data
Specifications of DIN 2391 ST 30 Seamless Precision Steel Tubes
| Parameter | Details |
|---|---|
| Standard | DIN 2391 (Part 1: Dimensions; Part 2: Technical Delivery Conditions) |
| Grade | St30Al (1.0212) / St30Si (1.0211) - identical mechanical properties, different chemical composition |
| Quality | Grade A (standard delivery); Grade C available on request for tighter tolerance + added certification |
| Outer Diameter | 4 mm to 190 mm (confirm against actual stocked range; market availability up to 260 mm) |
| Wall Thickness | 0.5 mm to 15 mm (confirm against mill stock) |
| Production Type | Cold drawn / cold rolled, seamless |
| Delivery Condition | BK / BKW (cold-worked, no heat treatment) or BKS / GBK / NBK (heat-treated - normalized or stress-relieved) |
| Length | Random lengths, typically 4m-7m unless exact length is ordered (max stock length typically up to 6000mm or 10m) |
| Yield Strength (ReH) | 215 N/mm2 minimum (for normalized condition) |
| Tensile Strength (Rm) | 290-420 MPa |
| Surface Finish | Smooth ID/OD, scale-free, suitable for hydraulic and precision mechanical applications |
| Equivalent Standards | EN 10305-1 (E215, approx.); ASTM A519 (approx. equivalent - confirm before citing) |
| Applications | Hydraulic cylinders, shock absorbers, steering system tubes, camshafts, precision mechanical components |
| Testing / Certification | EN 10204 3.1 mill test certificate; tensile, flattening, and flaring tests per DIN 2391 Part 2 |
DIN 2391 ST 30 Seamless Precision Steel Tubes Chemical Composition
| Steel Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) |
|---|---|---|---|---|---|
| St30Al | 0.10 max | 0.05 max | 0.55 max | 0.025 max | 0.025 max |
| St30Si | 0.10 max | 0.30 max | 0.55 max | 0.025 max | 0.025 max |
Mechanical Properties of DIN 2391 ST 30 Seamless Precision Steel Tubes
| Final Supply Condition | Tensile Property | Specification Value |
|---|---|---|
| Cold finished (hard) (BK) | Tensile strength Rm | 430 MPa min |
| Elongation at fracture A5 | 8 % min | |
| Cold finished (soft) (BKW) | Tensile strength Rm | 380 MPa min |
| Elongation at fracture A5 | 12 % min | |
| Cold finished and stress-relieved (BKS) | Tensile strength Rm | 380 MPa min |
| Yield strength ReH | 280 MPa min | |
| Elongation at fracture A5 | 16 % min | |
| Annealed (GBK) | Tensile strength Rm | 280 MPa min |
| Elongation at fracture A5 | 30 % min | |
| Normalized (NBK) | Tensile strength Rm | 290 - 420 MPa |
| Yield strength ReH | 215 MPa min | |
| Elongation at fracture A5 | 30 % min |
Equivalent Grades of DIN 2391 ST 30 Seamless Precision Steel Tubes
| Grade | Steel Number | EN Equivalent | GB Equivalent |
|---|---|---|---|
| DIN 2391 St30Al | 1.0212 | EN 10305-1 E215 | GB/T 3639 Grade 10 |
| DIN 2391 St30Si | 1.0211 | - | - |
Length Tolerance Chart of DIN 2391 ST 30 Seamless Precision Steel Tubes
| Length Range | Lower Tolerance | Upper Tolerance | Total Tolerance Range |
|---|---|---|---|
| Up to 500 mm | 0 mm | +2 mm | 0 to +2 mm |
| Above 500 mm up to 2000 mm | 0 mm | +3 mm | 0 to +3 mm |
| Above 2000 mm up to 5000 mm | 0 mm | +5 mm | 0 to +5 mm |
| Above 5000 mm up to 7000 mm | 0 mm | +10 mm | 0 to +10 mm |
| Greater than 7000 mm | By agreement | By agreement | Subject to mill negotiation |
Applications and Industrial of DIN 2391 ST 30 Seamless Precision Steel Tubes
- Automotive Industry
- Hydraulic & Pneumatic Machinery Industry
- General Mechanical Engineering Industry
- Construction Equipment Industry
- Agricultural Machinery Industry
- Furniture & Fitness Equipment Industry
Frequently Asked Questions
What are DIN 2391 ST 30 Seamless Precision Steel Tubes?
DIN 2391 ST 30 Seamless Precision Steel Tubes are cold-drawn, seamless carbon steel tubes manufactured to DIN 2391 standards for high dimensional accuracy and smooth surface finish.
What is DIN 2391 ST 30 steel used for?
DIN 2391 ST 30 steel is used in hydraulic systems, automotive components, mechanical engineering, precision machinery, and general engineering applications.
What is the difference between DIN 2391 ST 30 and ST 35 tubes?
ST 30 has lower carbon content and strength, making it easier to machine and form, while ST 35 offers higher strength and is suitable for more demanding applications.
Are DIN 2391 ST 30 tubes seamless or welded?
DIN 2391 ST 30 tubes are seamless precision steel tubes manufactured without welded joints for improved strength and dimensional accuracy.
Can DIN 2391 ST 30 Seamless Precision Steel Tubes be welded?
Yes. DIN 2391 ST 30 Seamless Precision Steel Tubes have good weldability and can be welded using standard welding methods with proper procedures.
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