GB/T 3077 is for alloy structure steels. It defines the hot rolled and forging alloy structure steels’ dimension, tolerance, technical requirements, etc. Main materials are 20Mn2, 30Mn2, 40Mn2, 45Mn2, 50Mn2, 27SiMn, 20Cr, 40Cr, 30CrMo, 35CrMo, 42CrMo, etc.

 

Product name	Alloy steel seamless tube 20Mn2 40Mn2
Standard	GB/T 3077 Alloy structure steels
Material	20Mn2 30Mn2 35Mn2 40Mn2 45Mn2 50Mn2
Dimension	OD: 16-245mm, WT1-32mm, Length: 3-6m
Delivery condition	Stress Relieved, Quenched and tempered
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 bundles with steel-hooped Short cut pipes: wooden box or metal frame

 

Steel Grade	C	Si	Mn
20Mn2	0.17-0.24	0.17-0.37	1.40-1.80
30Mn2	0.27~0.34	0.17~0.37	1.40~1.80
35Mn2	0.32~0.39	0.17~0.37	1.40~1.80
40Mn2	0.37-0.44	0.17~0.37	1.40~1.80
45Mn2	0.42~0.49	0.17~0.37	1.40~1.80
50Mn2	0.47~0.55	0.17~0.37	1.40~1.80

 

Material	Tensile strength (Mpa)	Yield  strength(Mpa)	Elongation (%)
	No less than
20Mn2	785	590	10%
30Mn2	785	635	12%
35Mn2	835	685	12%
40Mn2	885	735	12%
45Mn2	885	735	10%
50Mn2	930	785	9%

 

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

      A: Dingxin is a profession steel tube manufacturer locating in Jiaxing City, Zhejiang Province.

 

2. Q: How long is your delivery time?

      A: Generally it takes 30-50 days to manufacture the pipes.

 

3. Q: What is your term of payment?

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

 

4. Q: What is the trade term?

      A: Trade terms could be FOB, CIF, CFR, DAP, etc.

 

5. Q: What is port of landing?

      A: Shanghai port or Ningbo port.

 

http://www.dingxinsteeltube.com/