China Shandong Baote metal products Co., Ltd. specializes in producing steel pipe diameter: 6mm-1200mm!

Perennial sales: all kinds of seamless steel pipe, precision steel pipe, bright steel pipe, medium and thick wall steel pipe, cold drawn steel pipe, alloy steel pipe, medium and high pressure steel pipe, special equipment pipe, marine steel pipe, gas cylinder pipe, geological drilling pipe, oil casing, hydraulic support pipe, fluid pipe, stainless steel pipe, welded pipe, square pipe, etc.

The factors to increase the cold brittleness of cold rolled precision bright steel pipe are:

(1) Solid solution strengthening elements. Phosphorus increases the ductile brittle transition temperature; There are also molybdenum, titanium and vanadium; When the content is low, it has little effect, while when the content is high, the elements that increase the toughness brittleness transformation temperature are silicon, chromium and copper; Nickel decreased the ductile brittle transition temperature, and manganese decreased first and then increased the ductile brittle transition temperature.

(2) An element forming a second phase. The most important element of cold brittleness of cold-rolled precision bright steel pipe is carbon. With the increase of carbon content in cold-rolled precision bright steel pipe, the pearlite content in cold-rolled precision bright steel pipe increases. For every 1% increase of pearlite volume, the toughness brittleness transformation temperature increases by 2.2 ℃. Figure 2 shows the effect of carbon content on brittleness in ferrite pearlite steel. Micro alloying elements such as titanium, niobium and vanadium are added to form dispersed nitrides or carbonitrides, which leads to the increase of toughness brittleness transformation temperature of cold-rolled precision bright steel pipe.

(3) The grain size affects the ductile brittle transition temperature. With the grain coarsening, the ductile brittle transition temperature increases. Grain refinement reduces the cold embrittlement tendency of cold-rolled precision bright steel pipe, which is a widely used method.

Various types of steel pipes and non standard steel pipes can be created by suppliers

Spot sales of steel pipes: bid winning steel pipes, American standard steel pipes, German standard steel pipes, British standard steel pipes, Japanese standard steel pipes and French steel pipes. We sincerely welcome friends from all walks of life to visit, investigate and negotiate business, and hand over the order to us, so that the purchasing customers can save worry and effort. Our steel pipes are exported to Germany, the United States, South Africa, the Middle East, India, South Korea, Pakistan, Iran and other parts of the world.

Annual sales materials of Baote steel pipe: ASTM A53-B, A106A / B, St45-8, 10#, 20#, 35#, 45#, Q355 (ABCD) 20CrMo44, 4119, 4130, 4135, 4140, 4340, 20g, 40Mn2, 45Mn2, 27SiMn, 40MnB, 20mnvb, 20Cr, 40Cr, 35CrMo, 42CrMo, 12Cr1MoV, 38CrMoAl, 50CrV, 20CrMnSi, 30CrMnSi, 35CrMnSi, 20CrMnTi, 30crmnti, 40CrNiMoA, 15CrMoG 201, 202, 301, 304, 316, 321, 316L, 310S, etc

The company was founded in 2003. It abides by the contract and reputation. While continuously improving the competitiveness of customers through service, it has also won market praise for ourselves.