Seamless Cold Drawn Steel Pipe
Product Details
seamless cold drawn steel pipe
,cold drawn steel tube
,seamless steel pipe with warranty
Seamless Cold Drawn Steel Pipe
A seamless cold drawn steel pipe is a type of high-precision seamless steel tube manufactured through the cold drawing process. This process involves pulling (drawing) a seamless steel shell (hot-rolled or extruded) through a die and over a mandrel at room temperature to reduce its diameter and wall thickness to precise dimensions.
This method produces pipes with superior surface finish, tighter dimensional tolerances, enhanced mechanical properties, and a more uniform microstructure compared to hot-finished pipes. They are widely used in applications requiring high precision, strength, and reliability.
Key Characteristics & Advantages:
-
Excellent Surface Finish: Smooth, clean surface with minimal scale or imperfections.
-
High Dimensional Accuracy: Very tight tolerances on Outside Diameter (OD) and Wall Thickness (WT).
-
Enhanced Mechanical Properties: The cold working process significantly increases yield and tensile strength.
-
Improved Machinability: The uniform and often annealed structure makes them ideal for subsequent machining operations.
-
Wide Range of Applications: Used in precision machinery, hydraulic and pneumatic cylinders, automotive components, bearing sleeves, and critical structural parts
1. Common Materials / Grades
Seamless cold drawn pipes are typically made from carbon steel and alloy steel. The most common standard specifications include:
-
ASTM A519: Standard Specification for Seamless Carbon and Alloy Steel Mechanical Tubing. This is the most prevalent standard for cold drawn mechanical tubing.
-
ASTM A106: Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service (can be cold drawn for finishing).
-
DIN 2391: German standard for Seamless Precision Steel Tubes - Part 1: Cold Drawn Tubes.
-
JIS G3445: Japanese Industrial Standard for Carbon Steel Tubes for Machine Structural Purposes.
-
-
Common Grades:
-
Carbon Steels: 1020, 1025, 1026, 1045, C45 (1.0503), ST52 (1.0570)
-
Alloy Steels: 4140, 4130, 4340, 8620, 42CrMo4 (1.7225), 34CrMo4 (1.7220)
-
Bearing Steel: 100Cr6 (1.3505, AISI 52100)
2. Chemical Composition
The chemical composition varies significantly by grade. Here are typical examples:
| Grade / Standard | Carbon (C) | Manganese (Mn) | Phosphorus (P) max | Sulfur (S) max | Silicon (Si) | Other Elements |
|---|---|---|---|---|---|---|
| ASTM A519 1020 | 0.18-0.23% | 0.30-0.60% | 0.040% | 0.050% | 0.10-0.30% | - |
| ASTM A519 1045 | 0.43-0.50% | 0.60-0.90% | 0.040% | 0.050% | 0.10-0.30% | - |
| ASTM A519 4130 | 0.28-0.33% | 0.40-0.60% | 0.035% | 0.040% | 0.15-0.35% | Chromium (Cr): 0.80-1.10%, Molybdenum (Mo): 0.15-0.25% |
| DIN 2391 St52 | ≤ 0.22% | 1.00-1.60% | 0.045% | 0.045% | - | - |
| 42CrMo4 (1.7225) | 0.38-0.45% | 0.60-0.90% | 0.025% | 0.035% | 0.15 |
3. Mechanical Properties
The cold drawing process work-hardens the steel, significantly improving its strength. The final properties can be further adjusted by heat treatment (e.g., annealing, normalizing, quenching, and tempering).
| Grade / Standard | Yield Strength (min) | Tensile Strength | Elongation (min) | Hardness |
|---|---|---|---|---|
| ASTM A519 1020 | 415 MPa (60 ksi) | 483 MPa (70 ksi) | 10% | ~ 85 HRB |
| ASTM A519 1045 | 515 MPa (75 ksi) | 585 MPa (85 ksi) | 8% | ~ 95 HRB |
| ASTM A519 4130 | 435 MPa (63 ksi) | 560 MPa (81 ksi) | 15% | ~ 90 HRB |
| DIN 2391 St52 | 510 MPa | 630 - 780 MPa | 10% | - |
| 42CrMo4 (Annealed) | ~ 650 MPa | ~ 900 MPa | ~ 14% | ~ 270 HB |
Important Note on Properties:
Tags: seamless steel pipe, cold drawn steel pipe
-
"As-Drawn" vs. "Heat Treated": The values above are typical for the "as-drawn" condition. Heat treatment can drastically alter these properties. For example, a quenched and tempered 4140 tube can achieve a yield strength exceeding 965 MPa (140 ksi).
-
-
Anisotropy: Cold drawing creates directional properties. Mechanical properties are generally higher in the longitudinal direction (along the length of the tube) compared to the transverse direction.
-
-
Specification Governs: The required mechanical properties are always defined by the purchasing specification (e.g., ASTM A519, DIN 2391-1) and the specific grade ordered.
-
DIN2391 Precision Seamless Steel Tube
Product Name: DIN2391 Cold Drawn Precision Seamless Steel Tube Material: ST35, ST45, ST52 Size Range: OD: 6-88mm, WT: 1-15mm, Length: 5.8m/6m, maximal 11.8m Delivery Condition: BK, BKW, BKS, GBK, NBK Application: For high precision purpose, auto industry, like manipulator, Shock Absorber, Transmission Shaft, Steering Gear, Car Frame, etc. Stable Quality with Comeptitive Price. NBK(Bright Annealing) Heat Treatment, Surface is clean and smooth, without oxide scale Good -
SAE4130 Honed Hydraulic Cylinder Seamless Steel Tube
Product Name: SAE4130 ASTM A519 CW / SR Seamless Mechanical Tubing Honing Round Steel Tubing Size Range: OD: 40-500mm, WT: 1-30mm, Length: 5.8m/6m, maximal 11.8m Product Name ASTM A519 CW / SR Seamless Cold Drawn Honing Steel Tubing Material St35, St45, St52, E355, E255, 1020, 1045, 4130 Delivery Condition CW, SR Standard DIN2391 / EN10305-1 / ASTM A519 / GB3639 Size Range OD: 40-500mm, WT: 1-30mm Application High precision purpose, auto parts, oil cylinder, etc Round Billet -
E255 / St45 / 1020 Bright Annealed Cold Rolled Steel Tube
Product Name: E255 / St45 / 1020 Bright Annealing Precision Cold Rolled High Precision Seamless Steel Pipe Material: E235 , E255 , E355, St35, St45, St52, 1010, 1020, 4130 Size Range: OD: 6-88mm, WT: 1-15mm, Length: 5.8m/6m, maximal 11.8m Delivery Condition: +C, +LC, +SR, +A, +N Application: Fuel injection Pipe, Oil flow pipeline Automobile and motorcycle Shock Absorber Pipe Seat lifter Pipe Hydrau-cylinder Pipe Bicycle frame steel pipes Mechanical steel pipes for auto and -
Black Drill Rod Seamless Drill Pipe High Tolerance 3 - 11.8m Length 2 - 15m WT Size
XJY750 XJY850 wire-line drill pipes , Seamless cold drawing pipes for drill rod 1. Product Name: XJY850 Seamless Steel Tubing wire-line drill rods 2. Size Range: OD: 45-114.3m, WT: 2-15mm, Length:3m,3.06m 5.8m/6m, maximal 11.8m 3. Stable Quality with Comeptitive Price 4. Protective Atmosphere Heat Treatment, Surface is clean and smooth, without oxide scale 5. Good Extending and Bending Ability, Longer Work Life Product Name Seamless Steel Tubing wire-line drill rods Material
