1.We got the Russia customer inquiry for 32.5*8.2mm cold drawn seamless steel steel tube in October 2018, , the tube material is 35CrMo , quantity is 10tons , length is 7500mm . When we received the inquiry , we found the tube thickness 12.15 mm ,its very thick, and the length is very long , so its very difficult to make , and we believe there is nearly no factory can make it .
As our engineer is very experienced , with more than 20 years production experience in the cold drawn seamless steel tube production ,after details calculation , he told we can try to help customer make the tube , and then we start make test ,firstly we use the cold rolled production method, but after sevel times test ,we found the tube OD size reducing heavily , and the ID diameter size change heavily . So , we have to change the raw material round bar size and make new test again and again , in the mean time we change the core bar again and again , In the test stage , we waste lot raw material and time , but finally we make the tube size 32.3*9.4mm successfully , the tube size totally satisfy the customer request . And customer come to make the on-site test , he is very happy with the tube quality .
After the test finish, we arrange shipment to Russia the 10tons cold drawn seamless steel tube .
2.After about half Month , the customer got the 10 tons tube and are very satisfied , he arranged the next order 20tons cold drawn seamless steel tube for same size on 28th, December , 2018.
With last time order experience , we produced more quickly and smoothly , in the mean time , to guarantee the tube size and the mechanical property better , we improved the production method again .We found if we produce by one time cold rolled and two times cold drawn method can make the tube better . This time we produced 20tons tube only use 25 days and the tube size and mechanical property are more stable .Then We arrange the shipping fastly .
3.When customer get the cold drawn seamless tube , they are totally satisfy with our technique and quality ,they directly arrange us a bigger quantity order , totally about 100 tons . In this order , customer add more request to the tube ,the cold drawn seamless steel tube need do heat Treatment and polishing , the technical request is very high .
To guarantee the quality , we make test again and again , and we sent sample to customer for test .
After testing , the customer inform us to keep going on the large order production , and we plan to make the first batch order delivery in May .
Our company aim to be the top one supplier is the cold drawn seamless steel tube field in China, we make the tube size from 4mm-140mm , the tube size tolerance can reach 0.025mm ,Now we have 8 sets cold rolling production line and 8 sets cold drawn production line , from drilling hole process to the finally tube , we have full production line process. The tube delivery state can be BK, NBK,BKS,GBK,BKW ect
Warmly welcome you come to visit us and hope we can do business together happily .