Cold drawn seamless steel pipe manufacturer
Compared with solid steel such as round steel, fluid steel pipe has the same flexural and torsional strength and light weight. It is an economic section steel. It is widely used to manufacture structural parts and mechanical parts, such as oil drill pipe, automobile transmission shaft, bicycle frame and steel scaffold used in construction.
Manufacturing ring parts with steel pipes can improve material utilization, simplify manufacturing processes, and save materials and processing hours, such as rolling bearing rings, Jack sleeves, etc. at present, steel pipes have been widely used for manufacturing.
Seamless steel pipe for fluid transportation (GB / t8163-2008) is a general seamless steel pipe used to transport water, oil, gas and other fluids. Weight formula of fluid steel pipe: [(outer diameter wall thickness) * wall thickness] * 0.02466 = kg / M (weight per meter) it mainly produces representative grades of steel pipe 10#, 20#, Q345
As for the hardness test of Baotou fluid pipe with Rockwell hardness tester, only HRC and HRB scales are generally specified in Baotou fluid pipe standard. For annealed Baotou fluid pipe materials, it is generally specified that the hardness value shall not be greater than a certain HRB value corresponding to the variety of Baotou fluid pipe of each brand, which is generally in the range of 88-96 HRB. For Quenched and tempered martensitic stainless steel, generally corresponding to the variety of Baotou fluid pipe of each brand, it is specified that the hardness value is not less than a certain HRC value, generally in the range of 32-46 HRC. Lun nickel turbulence adjustment is obvious, but the merchants in Baotou fluid pipe market are very calm, and the quotation is still stable. From the market situation of Baotou fluid pipe, the current market atmosphere is relatively dull, the transaction is still relatively low, the terminal large-scale procurement is more cautious, and it is still dominated by sporadic procurement. In addition, the current market price is volatile and adjusted, the trend in the later stage is still uncertain, and the market wait-and-see atmosphere is very strong. Process performance inspection: flattening test, tensile test, impact test, flaring test, hardness test, metallographic test, bending test and nondestructive testing (including eddy current testing, X-ray testing and ultrasonic testing). In terms of stainless steel hardness testing, Rockwell hardness tester is an instrument worthy of priority. Its equipment is simple and easy to operate. It can directly read out the hardness value without professional inspectors. It has high test efficiency and is very suitable for factories. Baotou fluid tube has many characteristics and has certain advantages in application field. Chemical analysis: carry out chemical analysis on the chemical composition of the material, and the chemical composition meets the standard requirements. Air pressure and hydrostatic test: conduct hydrostatic test on the Baotou fluid pipe for pressure resistance one by one, and keep it at the specified pressure value for no less than 5 seconds without leakage. The hydrostatic pressure test of conventional supply is 2.45mpa. The pneumatic pressure test is p = 0.5mpaa. Corrosion test: the industrial corrosion-resistant Baotou fluid pipes provided shall be tested for corrosion resistance according to the standard provisions or the corrosion method agreed by both parties, and shall not have the tendency of intergranular corrosion. Lun Ni continues to show a trend of rising and falling. Although there is a slight rebound intention in the short term, it is speculated that the market may still maintain the shock consolidation pattern in the short term due to resistance constraints.