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Seamless Cold Drawn Steel Pipe

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Brand Name :	New Era
Model Number :	DIN/EN/JIS/ASTM
Certification :	ISO9001
Price :	Negotiation
Payment Terms :	T/T
Supply Ability :	3000 tons/month
Delivery Time :	45 days

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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.

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Seamless Cold Drawn Steel Pipe

Seamless Cold Drawn Steel Pipe

Seamless Cold Drawn Steel Pipe

Seamless Cold Drawn Steel Pipe

Key Characteristics & Advantages:

1. Common Materials / Grades

2. Chemical Composition

3. Mechanical Properties

seamless cold drawn steel pipe

cold drawn steel tube

seamless steel pipe with warranty

Seamless Cold Drawn Steel Pipe

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