Precision Steel tube,for electric motor gear

Structure with seamless steel tubes is used for structure and mechanical structure.

Steel grade : carbon steel:1020,1045

alloy steel : Q345, 20Cr,40Cr,20CrMo,30 CrMo,42CrMo etc.

Cold drawn ( cold rolled ) precision seamless steel tube is applied to mechanical structure,carbon pressure equipment. High precision, good surface finish.

Material	Carbon Steel and Alloy Steel
Section Shape	Round
Surface treatment	Oiled, phosphate etc
Outer Diameter	6-65mm
Wall Thickness	1-8mm
Seamless Steel Tube Standard	DIN2391, DIN17175, ASTM A106, ASTM A213, ASTM A53, ASTM A312, ASTM A179, SAE 4130. JIS G3445, JIS G3444, JIS G 3461, JIS G3441, JIS G3454 etc
Steel Tube Grade	Q345, 20Cr,40Cr,20CrMo,30 CrMo,42CrMo
Packing Details	1.Internal wrapped with plastic film. External wrapped with woven bags. 2. wooden boxes to pack. 3. Iron stand.
Certification	ISO9001
Delivery condition	BK BKW BKS GBK NBK
Length	1-12m as customer's requestment

Dimension tolerance comparision Chart
Outside Diameter	GB/T 3639	DIN2391(EN10305)	RAY steel tube standard	Special standard
6-30mm	+/-0.1 mm	+/-0.08 mm	+/-0.05 mm	+/-0.03 mm
31-40mm	+/-0.15 mm	+/-0.15 mm	+/-0.05 mm	+/-0.03 mm
41-50mm	+/-0.20 mm	+/-0.20 mm	+/-0.05 mm	+/-0.03 mm
51-60mm	+/-0.25 mm	+/-0.25 mm	+/-0.08 mm	+/-0.03 mm
61-65mm	+/-0.30 mm	+/-0.30 mm	+/-0.10 mm	+/-0.05 mm
Thickness	+/-0.12 mm	+/-0.10 mm	+/-0.05 mm	+/-0.03 mm

Chemical composition comparison Sheet:

Steel Grade	C	Si	Mn	S	P	Cr	Ni	Cu
30CrMo	0.26-0.34	0.17-0.37	0.40-0.70	≤0.035	≤0.035	0.80-1.10	≤0.30	≤0.30
SCM430	0.28-0.33	0.15-0.35	0.60-0.90	≤0.030	≤0.030	0.90-1.20	≤0.25	≤0.30
4130	0.28-0.33	0.15-0.35	0.40-0.60	≤0.040	≤0.035	0.80-1.10	≤0.030	≤0.030
40Cr	0.37-0.44	0.17-0.37	0.50-0.80	≤0.030	≤0.030	0.80-1.10	≤0.30	≤0.30
SCr440	0.38-0.43	0.15-0.35	0.60-0.90	≤0.030	≤0.030	0.90-1.20	≤0.25	≤0.030
5140	037-0.44	0.17-0.37	0.50-0.80	≤0.035	≤0.035	0.80-1.10	≤0.030	≤0.030
40CrMo	0.35-0.45	0.15-0.40	0.40-0.70	≤0.035	≤0.035	1.00-1.50
35Cr	0.32-0.39	0.17-0.37	0.50-0.80	≤0.035	≤0.035	0.80-1.10	≤0.030	≤0.030
5135	0.33-0.38	0.15-0.35	0.60-0.80	≤0.040	≤0.035	0.80-1.05
SCr435	0.33-0.38	0.15-0.35	0.60-0.90	≤0.030	≤0.030	0.80-1.05	≤0.25	≤0.030
34Cr4	0.30-0.37	≤0.40	0.60-0.90	≤0.035	≤0.035	0.90-1.20	≤0.25	≤0.030
1.7033	0.27-0.33	0.15-0.30	0.60-1.10	≤0.040	≤0.035	0.75-1.20

Mechanical performance parameter:

Steel Grade	Tensile Strength	Yield strength	Elongation	Hardness （BK)
	Mpa	Mpa	%	HB
30CrMo	≥930	≥785	≥12	≤229
4130	≥930	≥786	≥12	≤229
SCM430	≥930	≥785	≥12	≤229
40Cr	≥980	≥785	≥9	≤207
SCr440	≥980	≥785	≥12	≤207
5140	≥980	≥785	≥9	≤207
40CrMo	≥1080	≥930	≥12	≤217
35Cr	≥930	≥735	≥11	≤207
5135	≥536	≥555	≥31	≤414 (HBW)
SCr435	≥930	≥735	≥11	≤207
34Cr4	≥930	≥735	≥11	≤207
1.7033	≥836	≥538	≥24	≤233 (HBW)