Cold Drawn Seamless Carbon Steel Tube 10# 20# 35# 45# 55#

GB/T 3639 is for seamless cold-drawn or cold rolled steel tubes for precision applications. It specifies the steel grade, dimension, appearance, weight and tolerance, delivery condition, testing method, testing standard, packing standard, tagging, MTC, etc.

 

Dingxin Steel Tube has around 20 years experience for manufacturing cold drawn seamless tube and cold rolled seamless tube. Quality certificated process and professional techniques are adopted to meet the industry standard as well as client request.

 

Product name	Cold drawn seamless carbon steel tube 10# 20# 35# 45# 55#
Standard	GB/T 3639
Material	10#, 20#, 35#, 45#, 55#
Dimension	OD: 16-245mm, WT1-32mm, Length: 3-6m or cut length based on customer requirements.
Delivery condition	+C, +LC, +SR, +A, +N
Certificate	ISO 9001, IATF 16949
Applications	Automotive suspension part, such as bushing, tie rod, tension pulley, drag link, stabilizer link, torque rod etc.
Packaging	Long pipe: hexagonal bundle, covered with plastic fabric and steel strips Short cut pipes: wooden box or metal frame

 

Steel Grade	C	Si	Mn	P	S	Cr	Ni	Cu
10#	0.07-0.13	0.17-0.37	0.35-0.65	≤0.035	≤0.035	≤0.15	≤0.30	≤0.25
20#	0.17-0.23	0.17-0.37	0.35-0.65	≤0.035	≤0.035	≤0.25	≤0.30	≤0.25
35#	0.32-0.39	0.17-0.37	0.50-0.80	≤0.035	≤0.035	≤0.25	≤0.30	≤0.25
45#	0.42-0.50	0.17-0.37	0.50-0.80	≤0.035	≤0.035	≤0.25	≤0.30	≤0.25
55#	0.52-0.60	0.17-0.37	0.50-0.80	≤0.035	≤0.035	≤0.25	≤0.30	≤0.25

 

Delivery condition	Symbol	Description
Cold-finished/hard	+C	After the final cold-finished process, there is no heat treatment
Cold-finished/soft	+LC	After the heat treatment, there is a suitable cold-finished process
Stress-relieved	+SR	After the final cold-finished process, the tubes are heat treated to relieve stress
Annealed	+A	Tubes are annealed under the controlled atmosphere after cold drawn
Normalized	+N	Tubes are normalized under the controlled atmosphere after cold drawn

 

Grade	Delivery condition
	+C		+LC		+SR			+A		+N
	Rm/Mpa	A/%	Rm/Mpa	A/%	Rm/Mpa	Re/Mpa	A/%	Rm/Mpa	A%	Rm/Mpa	Re/Mpa	A/%
	No less than
10#	430	8	380	10	400	300	16	335	24	320~450	215	27
20#	550	5	520	8	520	375	12	390	21	440~570	255	21
35#	590	5	550	7	-	-	-	510	17	≥460	280	21
45#	645	4	630	6	-	-	-	590	14	≥540	340	18
Q355B	640	4	580	7	580	450	10	450	22	490~630	355	22

Reference: GB/T 3639

Rm: tensile strength, Re: yield strength, A: elongation

 

● Outer diameter and inner diameter with high precision in tolerance

● Excellent microstructure

● Smooth drawn surface

● Customized heat treatment with in-house production

 

1. Q: Are you a trading company or manufacturer?

      A:Dingxin is a profession steel tube manufacturer locating in Jiaxing City, Zhejiang Province. Dingxin has good reputation for its premium quality and high delivery performance.

 

2. Q: What is your packing?

      A: Long pipes will be packed in hexagonal bundles with steel-hooped. Short cut pipes will be packed with wooden box, metal frame, etc.

 

3. Q: What is your terms of payment?

      A:30% advance payment, 70% balance against B/L copy. Or LC at sight.

 

4. Q:Can I get a sample to check the quality?

      A: Yes, Dingxin can provide one or two pieces of sample for free. If we don’t have the exact same size that our clients required, we will provide the same material with similar size for quality check. The express fee is paid by the client.

 

 

Why choose us?

• Our Automotive Tubes are designed to withstand even the harshest operating conditions, ensuring reliable performance.
• We provide excellent service and maximum support to our customers with high quality products, favorable price, fast delivery and perfect after-sales service, and strive to establish long-term cooperation and win-win strategic partnership with our customers.
• Our experienced professionals are always available to offer expert guidance and support to our clients.
• The company strives to be honest in its operation, science and technology first, and try its best to provide customers with a full range of after-sales services.
• Our experienced professionals can provide customized solutions to meet the specific needs of our clients.
• We insist on the principle of 'Specialization and Practical' for design of products. We pursue excellence and continuous improvement, and try our best to offer excellent-quality products with favorable prices and perfect services to customers.
• Our competitive pricing ensures that our customers receive the best value for their investment.
• We continue to develop ourselves by training and promoting our employees, and we allow our employees to achieve professional improvement and human capital appreciation.
• We pride ourselves on our ability to deliver high-quality Automotive Tube products that meet or exceed industry standards.
• Our company has focused on Cold Drawn Seamless Carbon Steel Tube 10# 20# 35# 45# 55# for many years, and can produce various specifications of Cold Drawn Seamless Carbon Steel Tube 10# 20# 35# 45# 55# according to customer needs .

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