GB/T3639 for Auto Parts Cold Rolling 2 Roller 3 Roller Precision Bright Seamless Welded Carbon and Alloy Stainless Steel Tube

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Product Description

Basic Information
Technique
Cold Rolled
Material
Carbon, Alloy, Stainless
Surface Treatment
Oiled
Section Shape
Round
Size Tolerance (3-Roller)
-0.05/+0.05mm (OD & ID)
Size Tolerance (2-Roller)
-0.1/+0.1mm (OD & ID)
Surface Appearance
Smooth and Bright
Length
5-12m Random or Fixed Length
Production Capacity
3000 Tons Per Year
Specification
OD 5-100MM X ID 4-98MM
Product Description
Precision Steel Tube
Cold Rolling Tube
🎯
High Precision & Tight Tolerance: Produced via cold rolling. OD and ID tolerance can reach -0.1/+0.1mm. Utilizing our 3-roller machine, we can achieve precision within -0.05/+0.05mm. No oxide skin layer on surfaces; finish quality is exceptional.
💪
Excellent Mechanical Properties: High precision cold rolling seamless steel pipes can withstand high pressure, cold bending, expanding, and pressing flat without cracking.
Cost & Time Efficiency: Largely used to save steel materials, promote machining efficiency, and significantly decrease processing time and expenses.
Production Advantage
Steel Pipe Quality
🛠 Production Process (BK Delivery)
Steel round bars cutting → Billets heating → Billets piercing → Billets pickling → Inspection → Cold rolling → Pipes inspection → Straightening → Cutting ends → Packing
Available Size List
OD/WT(mm)0.511.522.533.544.555.56101518
5------------
10--------
20---
50-
100-
Inventory 1
Inventory 2
Inventory 3

Our group has been in the steel products industry for more than 10 years. Located in a major steel pipe base, we have developed into a modern international group. Currently, we operate two production plants for steel pipes and plate series, along with three warehouses. Our yearly production scale reaches 500,000 tons, with warehouse stocks consistently above 20,000 tons.

We supply high-quality products including steel pipes, bars, rock bolts, galvanized coils, and more. Our processing services include anti-rust protection, cutting, heat treating, bending, and CNC machining. We prioritize quality and integrity, believing that commodity quality is the life of the company.

Logistics
Shipping
Frequently Asked Questions
🔹 What are your payment terms?
Our usual terms are 30% TT as a deposit and the balance paid after seeing the copy of the bill of lading. We also accept D/P and LC terms.
🔹 How long is the delivery time?
For stock goods, we deliver within 5 days. Production orders under 200 tons usually take 20 days.
🔹 Can you handle partial shipments?
Yes, we follow client requests regarding partial shipments; it is not a problem for us.
🔹 What is your Minimum Order Quantity (MOQ)?
For stock items, we supply starting from one piece. For production orders, the MOQ is 3 tons.
🔹 Can I get a sample for quality inspection?
We provide free samples for values under 30 USD (client pays express charges). For higher values, costs are shared.
🔹 What is the mode of transportation?
Ocean freight is primary. We choose the fastest ship lines or follow client instructions. Railways and air (for samples) are also available.

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