求购管材

Our company is in need of components for producing circulating pumps namely steel pipes for making bush sleeves. We need three types of steel pipes.
The size of the first type of steel pipes is : 245 mm in diameter, 600 mm length and 50 mm wall thickness.
The size of the second type of steel pipes is : 245 mm in diameter, 600 mm length and 40 mm wall thickness.
The size of the third type of steel pipes is: 245 mm in diameter, 600 mm length and 30 mm wall thickness.
All three types of stee pipes should be made out of carbon steel  . The chemical structure of steel is as follows


Steel        С        Mn        Si        Cr        Cu        Ni        P        S       
60        0,57
0,65        0,5
0,8        0,17
0,37        0,25        0,3        0,3        0,035≤        0,04≤       
70        0,67
0,75        0,5
0,8        0,17
0,37        0,25≤        0,2≤        0,25≤        0,035≤        0,035≤       

Physical characteristics of steel are as follows:
Strength not less than 680 (69) MPa                     
Yield not less than 400 (41)  MPa                          
Extension not less than δ, 12 %                          
Contraction not less than ψ, 35 %   

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