Cold Drawn Seamless Pipe

Specifications

Product Name	Cold Drawn Seamless Pipe (CDS Tubing)
Common Materials	10#, 20#, 45#, ASTM A106 B, ASTM A106 C, 1026, ST35, ST45, ST52, E355, 1018, 1045
Production Process	Cold Drawn
Outer Diameter	3 – 140 mm (0.250″ – 12.000″)
Wall Thickness	0.5 – 20 mm (0.035″ – 1.500″)
Length	3m / 6m / 9m / 12m
Surface Condition	Bright / Phosphated / Oiled
Standards	DIN 2391 / EN 10305-1 / GB/T 3639 / ASTM A106 / ASTM A519
Delivery Condition	BK / BKW / BKS / GBK / NBK

Differences Between HFS and CDS Pipe

• HFS: Hot Finished Seamless Pipe.
• CDS: Cold Drawn Seamless Pipe.

Comparison Item	Hot Finished Seamless Pipe (HFS)	Cold Drawn Seamless Pipe (CDS)
Production Process	High temperature rolling	Room temperature cold drawing
Size Range	Large outer diameter (over 1000mm)	Small outer diameter (3-140mm)
Dimensional Accuracy	General (±1% approximately)	Extremely high (±0.05mm)
Surface Quality	Rough with oxide scale	Bright, Ra≤1.6μm
Mechanical Properties	Basic level	Higher strength
Price	Low	Relatively high
Typical Applications	Fluid transportation, structural support	Hydraulic cylinders, precision machinery

Advantages

• High Dimensional Accuracy: Different from HFS pipes, CDS pipes feature extremely high precision, making them the first choice for high-requirement scenarios, especially suitable for hydraulic systems.
• Excellent Mechanical Properties: Higher tensile strength and yield strength than hot-rolled pipes, capable of withstanding high pressure and bending requirements perfectly.
• Superior Surface Quality: Overall bright surface without oxide scale and burrs, friendly to subsequent processing.
• Good Machinability: It supports cold bending, flaring, necking, drilling and turning processing, and can manufacture slender pipes that cannot be achieved by hot-rolled pipes.

Applications

• Hydraulic Industry: The preferred pipe material for hydraulic cylinders and air cylinders, widely used in high-pressure oil pipes for forklift cylinders, jacks, excavators and cranes.
• Automobile & Machinery Industry: Used for transmission shaft rods and shock absorber casings. The thin-wall design realizes weight reduction, and the products are widely applied in semiconductor, military and nuclear power plant industries.
• Energy Industry: Applied to crane booms, oil and gas drilling equipment, mining machinery structural parts and underground tools.
• Precision Component Pipes: Served as stable blank pipes for automated production, including motor housings, precision shaft sleeves, as well as ship and bridge support pipes.

Chemical Composition

Element	Content Range
Carbon (C)	0.07% – 0.50%
Silicon (Si)	0.10% – 0.55%
Manganese (Mn)	0.29% – 1.60%
Sulfur (S)	≤ 0.040%
Phosphorus (P)	≤ 0.040%

Mechanical Properties of Each Grade

GB Standard Series

	10# Carbon Steel	20# Carbon Steel	45# Carbon Steel
Tensile Strength	≥335MPa	≥410MPa	≥600MPa
Yield Strength	≥205MPa	≥245MPa	≥355MPa
Elongation	≥31%	≥25%	≥16%

US Standard Series

	ASTM A106 B	ASTM A106 C	AISI 1026
Tensile Strength	415–585MPa	485–620MPa	≥440MPa
Yield Strength	≥240MPa	≥275MPa	≥260MPa

German / European Standard Series

	ST35/E235	ST45/E255	ST52/E355
Tensile Strength	≥340MPa	≥450MPa	≥490MPa
Yield Strength	≥235MPa	≥255MPa	≥355MPa

Production Process

Seamless cold drawn steel tube adopts a two-step manufacturing process: hot-rolled rough pipe rough processing plus room-temperature cold drawing finishing process.

This cold drawing procedure is the key advantage that distinguishes our cold drawn seamless pipe from ordinary hot-finished seamless pipes (HFS).

1. Hot-rolled pipe forming: Round steel billets are pierced into hollow hot-rolled capillary tubes by piercing machines, then rolled into hot-rolled rough pipes through rolling mills.
2. Pre-treatment before cold drawing: Acid pickling for rust removal, phosphating and oil coating to obtain clean and smooth pipe surfaces.
3. Room-temperature cold drawing: The rough pipes are drawn multiple times at room temperature to reduce outer diameter and wall thickness, and improve the surface finish and yield strength of the steel pipes.
4. Heat treatment: Cold drawing causes work hardening and residual internal stress. Annealing or normalizing treatment is carried out to ensure pipe toughness.
5. Sizing, finishing and flaw detection: Multi-roller rotary sizing ensures unified roundness and straightness of finished pipes, followed by polishing, end trimming, deburring and non-destructive testing.

Delivery State & Surface Types

Mainstream Delivery States

• BK: As Drawn, with anti-rust oil, silver bright surface, no annealing treatment.
• BK+S: Cold drawn and pickled, oil and oxide scale removed, matte clean surface without oil film.
• BKS: Stress relief annealing, low oxidation, soft bright surface with good plasticity.

Customized Delivery States

• GBK: Bright full annealing, mirror bright surface under protective atmosphere, no oxide scale.
• NBK: Normalizing annealing, thin oxide layer on surface with optimal plasticity.

Why Choose Glory Steel?

1. Factory direct supply: Equipped with complete independent cold drawn steel pipe production lines, all products comply with international standards including ASTM, DIN and Chinese national standards.
2. Complete specifications: Outer diameter ranging from 3–140mm and wall thickness from 0.5–20mm. 10#, 20# and other mainstream materials are in stock with multiple material options available.
3. Flexible customization: Custom fixed-length cutting, bright / phosphated / oiled surface treatment available, with preferential discount for bulk orders.
4. Competitive price and punctual delivery: Benefiting from factory direct cost advantages, we provide highly competitive prices and fast order delivery.

Glory Steel factory, located in Tianjin, China, is an ISO 9001, ISO 14001, and CE certified factory with an annual output of 100,000 tons. We specialize in manufacturing high-precision CDS cold drawn seamless carbon steel tubing, covering grades 10#, 20#, 45#, ASTM A106 B / A106 C, AISI 1026, ST35, ST45, ST52, E355 complying with DIN 2391, EN 10305-1, GB/T 3639 and ASTM A519 standards. With our high-quality products and services, we export to over 120 countries.