precision seamless steel tube

Precision seamless steel tube is a kind of high precision tubing through cold rolling or cold drawing process. Due to precision tubing without oxidation layer inside and outside wall, wearing high pressure without leakage, high precision and finish, cold bending deformation, flaring and flattening without cracks etc. it is mainly applied in producing pneumatic or hydraulic components of the products such as oil cylinder and gas cylinder.

 

Applications: It is mainly used in the manufacture of mechanical structure, hydraulic equipment and car parts etc.

Chemical composition(%):

Standard	Material N.O.	Mfg. Process	C max	Si max	Mn max	P max	S max
St35	1.0308	S	0.17	0.35	0.4	0.05	0.05
St45	1.0408	S	0.21	0.35	0.4	0.05	0.05
St52	1.0508	S	0.22	0.55	1.6	0.05	0.05

Mechanical and technological properties:

Standard	Material N.O.	Cold-finished hard(BK)		Cold-finished/soft (BKW) 3)
		Rm(Mpa)	A(%)	Rm(Mpa)	A(%)
St 35/E235	1.0308	480	6	420	10
St 45	1.0408	580	5	520	8
St 52/E355	1.0508	640	4	580	7

Standard	Cold finished (soft)(BKW)			Annealed (GBK)		Normalized (NBK)
	Rm(Mpa)	ReH (Mpa)	A(%)	Rm(Mpa)	A(%)	Rm (Mpa)	ReH (Mpa)	A(%)
St 35/E235	420	315	14	315	25	340-470	235	25
St 45	520	375	12	390	21	440-570	255	21
St 52/E355	580	450	10	490	22	490-630	355	22