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What is automotive steel tubing?

What is automotive steel tubing?

Automotive steel pipes refer to tubular components made of steel used in the construction of exhaust systems, hydraulic systems, fuel systems, and other pipelines in automobiles. These steel pipes play a role in transporting liquids or gases and are designed to withstand high temperatures and pressures in automotive engineering.

Advantages of automotive tubing:

Excellent mechanical performance, favorable for subsequent processes such as cold bending, extrusion, and expansion. Good surface smoothness meets the surface quality requirements for subsequent processes such as electrophoresis, painting, spraying, galvanizing, and chrome plating. High dimensional accuracy and well-organized metallographic structure.

Specifications of automotive steel tubing:

O.D 16-245mm, WT 1-32mm

Standards for automotive steel tubing:

GB/T3639 Cold-drawn or cold-rolled precision seamless steel pipe

DIN2391 Cold-drawn precision seamless steel pipe

DIN2393 Welded precision steel pipe with special dimensional accuracy

EN10305-1 Delivery conditions for precision steel tubes Part 1: Cold-drawn seamless steel tubes

EN10305-2 Delivery conditions for precision steel tubes Part 2: Cold-drawn welded steel tubes

ASTM A519 Seamless carbon and alloy steel mechanical tubing

ASTM A513 Electric-resistance-welded carbon and alloy steel mechanical tubing

JIS G3445 Carbon steel tubes for machine structural purposes

JIS G4051 Carbon steel for machine structural use

Steel grades for automotive tubing:

10#, 20#, 35#, 45#, 55#, Q355B, 25Mn, 16MnCr5, 20MnCr5, 30CrMo, 35CrMo, 42CrMo, 20Cr, 40Cr, 20CrNiMo; ST37, ST45, ST52, 34CrMo4, 42CrMo4; E235, E255, E355; 1010, 1020, 1026, 1035, 1045, 1050, 4130, 4140, 8620; STKM 11A, STKM 12B, STKM 13C, STKM 14B; S10C, S20C, S35C, S45C, etc.

Chemical Composition

Grade	C	Mn	Si	Cr	Mo	P	S	Other Elements
10#	0.07-0.14	0.25-0.55	≤0.35	-	-	≤0.045	≤0.050	-
20#	0.17-0.24	0.35-0.65	≤0.35	-	-	≤0.045	≤0.050	-
35#	0.32-0.39	0.50-0.80	≤0.35	-	-	≤0.035	≤0.035	-
45#	0.42-0.50	0.50-0.80	≤0.35	-	-	≤0.035	≤0.035	-
55#	0.52-0.60	0.50-0.80	≤0.35	-	-	≤0.035	≤0.035	-
Q355B	0.12-0.20	1.0-1.6	≤0.50	-	-	≤0.030	≤0.030	V, Ti, Nb ≤0.15
25Mn	0.22-0.29	1.00-1.30	≤0.35	-	-	≤0.030	≤0.030	-
16MnCr5	0.14-0.19	1.00-1.30	≤0.40	0.80-1.10	-	≤0.025	≤0.035	-
20MnCr5	0.17-0.22	1.00-1.30	≤0.40	1.00-1.30	-	≤0.025	≤0.035	-
30CrMo	0.26-0.34	0.50-0.80	≤0.35	0.90-1.20	0.15-0.30	≤0.030	≤0.030	-
35CrMo	0.32-0.40	0.40-0.70	≤0.40	0.80-1.10	0.15-0.25	≤0.035	≤0.035	-
42CrMo	0.38-0.45	0.60-0.90	0.15-0.40	0.90-1.20	0.15-0.30	≤0.035	≤0.035	-
20Cr	0.17-0.24	0.30-0.60	≤0.35	0.70-1.00	-	≤0.030	≤0.030	-
40Cr	0.37-0.44	0.50-0.80	≤0.35	0.80-1.10	-	≤0.030	≤0.030	-
20CrNiMo	0.17-0.23	0.40-0.70	0.17-0.37	0.40-0.70	0.15-0.25	≤0.025	≤0.030	Ni: 1.00-1.40
ST37	≤0.17	≤1.40	≤0.50	-	-	≤0.045	≤0.045	-
ST45	0.21-0.28	0.70-1.00	≤0.50	-	-	≤0.045	≤0.045	-
ST52	0.17-0.22	1.30-1.65	≤0.55	-	-	≤0.045	≤0.045	-
34CrMo4	0.30-0.38	0.50-0.80	≤0.40	0.90-1.20	0.15-0.30	≤0.025	≤0.035	-
42CrMo4	0.38-0.45	0.60-0.90	0.15-0.40	0.90-1.20	0.15-0.30	≤0.025	≤0.035	-
E235	≤0.17	≤1.20	≤0.35	-	-	≤0.045	≤0.045	-
E255	≤0.21	≤1.40	≤0.35	-	-	≤0.045	≤0.045	-
E355	≤0.22	≤1.60	≤0.55	-	-	≤0.045	≤0.045	-
1010	0.08-0.13	0.30-0.60	-	-	-	≤0.040	≤0.050	-
1020	0.18-0.23	0.30-0.60	-	-	-	≤0.040	≤0.050	-
1026	0.22-0.28	0.60-0.90	-	-	-	≤0.040	≤0.050	-
1035	0.32-0.38	0.60-0.90	-	-	-	≤0.040	≤0.050	-
1045	0.43-0.50	0.60-0.90	-	-	-	≤0.040	≤0.050	-
1050	0.48-0.55	0.60-0.90	-	-	-	≤0.040	≤0.050	-
4130	0.28-0.33	0.40-0.60	0.15-0.35	0.80-1.10	0.15-0.25	≤0.040	≤0.040	-
4140	0.38-0.43	0.75-1.00	0.15-0.35	0.80-1.10	0.15-0.25	≤0.040	≤0.040	-
8620	0.18-0.23	0.70-0.90	0.15-0.35	0.40-0.60	0.15-0.25	≤0.040	≤0.040	Ni: 0.40-0.70
STKM 11A	0.10-0.16	0.27-0.63	0.10-0.35	-	-	≤0.035	≤0.035	-
STKM 12B	0.16-0.22	0.30-0.65	0.10-0.35	-	-	≤0.035	≤0.035	-
STKM 13C	0.18-0.23	0.30-0.65	0.10-0.35	-	-	≤0.035	≤0.035	-
STKM 14B	0.18-0.23	0.30-0.65	0.10-0.35	-	-	≤0.035	≤0.035	-
S10C	0.08-0.13	0.30-0.60	-	-	-	≤0.040	≤0.050	-
S20C	0.18-0.23	0.30-0.60	-	-	-	≤0.040	≤0.050	-
S35C	0.32-0.38	0.60-0.90	-	-	-	≤0.040	≤0.050	-
S45C	0.42-0.48	0.60-0.90	-	-	-	≤0.040	≤0.050	-

Mechanical Properties

Grade	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)
10#	≥335	≥205	≥25
20#	≥410	≥245	≥25
35#	≥530	≥315	≥20
45#	≥600	≥355	≥16
55#	≥690	≥450	≥14
Q355B	≥470	≥355	≥20
25Mn	≥490	≥335	≥22
16MnCr5	≥550	≥275	≥14
20MnCr5	≥600	≥295	≥14
30CrMo	≥810	≥590	≥12
35CrMo	≥930	≥780	≥12
42CrMo	≥930	≥780	≥12
20Cr	≥520	≥295	≥12
40Cr	≥850	≥550	≥14
20CrNiMo	≥930	≥685	≥12
ST37	360-510	≥235	≥25
ST45	440-580	≥255	≥22
ST52	490-630	≥355	≥22
34CrMo4	≥800	≥650	≥14
42CrMo4	≥930	≥780	≥12
E235	340-510	≥235	≥26
E255	410-560	≥255	≥23
E355	490-630	≥355	≥22
1010	≥305	≥175	≥28
1020	≥380	≥205	≥25
1026	≥415	≥240	≥24
1035	≥540	≥305	≥18
1045	≥620	≥420	≥14
1050	≥690	≥450	≥12
4130	≥560	≥460	≥25
4140	≥655	≥415	≥25
8620	≥620	≥310	≥18
STKM 11A	≥315	≥195	≥30
STKM 12B	≥370	≥235	≥25
STKM 13C	≥410	≥275	≥20
STKM 14B	≥370	≥235	≥25
S10C	≥305	≥175	≥28
S20C	≥380	≥205	≥25
S35C	≥540	≥305	≥18
S45C	≥570-710	≥335	≥16

Delivery conditions for automotive steeel tubing:

Cold worked/hard (+C) (BK)

Cold worked/soft (+LC) (BKW)

Stress-relieved after cold working (+SR) (BKS)

Annealed (+A) (GBK)

Normalized (+N) (NBK)

Quenched and tempered (QT)

Applicant of Automotive tubing

Automotive tubing refers to high-precision cold-drawn/cold-rolled seamless steel pipes, primarily used in various engine systems, transmission systems, drivetrain systems, steering systems, and chassis system components for passenger and commercial vehicles. The product exhibits high and stable quality, serving numerous domestic and international original equipment manufacturers (OEMs) and high-end aftermarket component manufacturers.

Automotive steel tubular

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