Tubes for Mechanical and Automobile

Seamless Steel Tubes for Mechanical and Automobile usage for Backbone of Automobile and rear axle tube, manufacturing and processing of precision equipments, instruments and apparatus.

Standard packaging is used to prevent damage to the material during shipping. If you need custom packaging for your order, please let us know what your requirements are and we will accommodate your specific needs.

Production Standard, Grade, Steel No:

Your tubular products representative will be happy to work with you to develop the information that is required. Sunny Steel supply a 1/2 million foot inventory of carbon steel pressure tubing including boiler tubes, condenser tubes and heat exchanger tubes all made in the China.

Our carbon steel pressure tubing inventory is manufactured in accordance with ASME SA-178 A and/or ASME SA-214 in diameters of 3/4″ through 4”.

Application:

Backbone of Automobile and rear axle tube
Manufacturing and processing of precision equipments, instruments and apparatus

Delivery Condition: GBK, BKS, BK, BKW, NBK

Inspection and Test: Chemical Composition, Mechanical Properties, Visual and Dimension Test, NDT, Grain Size Test

Surface treatment: Oil-dip, Varnish, Shot Blasting

Grade and Chemical Composition (%)

Grade	C	Mn	P≤	S≤	Si	Cr	Mo
1010	0.08-0.13	0.30-0.60	0.04	0.05	-	-	-
1020	0.18-0.23	0.30-0.60	0.04	0.05	-	-	-
1045	0.43-0.50	0.60-0.90	0.04	0.05	-	-	-
4130	0.28-0.33	0.40-0.60	0.04	0.05	0.15-0.35	0.80-1.10	0.15-0.25
4140	0.38-0.43	0.75-1.00	0.04	0.05	0.15-0.35	0.80-1.10	0.15-0.25

Typical Mechanical Properties

Grade	Condition	Tensile strength	Yield stength	Elongation
Grade	Condition	Mpa(min)	Mpa(min)	%(min)
1020	CW	414	483	5
	SR	345	448	10
	A	193	331	30
	N	234	379	22
1025	CW	448	517	5
	SR	379	483	8
	A	207	365	25
	N	248	379	22
4130	SR	586	724	10
	A	379	517	30
	N	414	621	20
4140	SR	689	855	10
	A	414	552	25
	N	621	855	20

Minimum Quantities

Hot-finished carbon and alloy—10,000 pounds, or 4,536 kilograms minimum.
Cold-drawn carbon and alloy—5,000 pounds minimum or 125 feet minimum, 2,268 kilograms minimum or 38.1 meters minimum, whichever is greater.
Quantity variation—standard ±10% of the ordered weight, or ±25 feet or 7.61 meters, whichever is greater.

Special Configurations

Tubular Products special seamless tubing configurations start with the highest quality steels.
Grade, chemical analysis and surface condition are carefully considered, and production processes are tailored to achieve the best tubing for the end use.
The configurations are formed from round tube by cold drawing.
The tube is drawn over a shaped mandrel or through a shaped die, or both. Improved tolerances, finishes and mechanical properties result.

Machining Allowances & Production Tolerances

Hollow bar is manufactured in the size ranges most frequently required by mechanical engineering manufacturing companies. However, in the case of hollow bar, the tolerance range for the outside diameter lies in the plus range, and for the inside diameter in the minus range. The wall thickness tolerance is determined by the degree of centre offset; this is due to the effect of the tolerance for the outside and inside diameter, the wall thickness and the centre offset. (See diagram below.)

In the case of mechanical tubing to ASTM A 511, the outside diameter and the wall dimensions generally lie in the centre of the tolerance range. Thus, when ordering product for machining it is important to take into account the differences in the tolerances between the hollow bar and the ASTM A 511 mechanical tubing specifications. In most cases the machining set up is based on centring the outside diameter.

Size Range

Tubular products seamless mechanical tubing is furnished in both cold-drawn and hot finished form in a wide range of sizes, from 1.375″ to 7.750″ OD and from 0.188″ to 1.625″ wall thickness.