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(1) seamless steel tube manufacturing process can be divided into: hot rolled (extrusion), cold-rolled (pull), thermal expansion steel tube about this basic types.
(2) welded in accordance with manufacturing processes can be divided into: straight seam welded steel pipes, submerged arc welding steel pipe, plate rolling butt welding pipe, welded steel pipe thermal expansion. In accordance with the shape of the pipe can be divided into square tubes, rectangular tubes, octagonal, hexagonal, D-shaped, pentagonal, etc. shaped steel tubing. That need to withstand the pressure of fluid and gas pipe must be carried out hydraulic pressure test and ray testing to test its internal pressure to withstand and steel quality (2 steel mechanical properties of steel is to ensure that end-use properties (mechanical properties) is an important indicator, it depends on the steel the chemical composition and heat treatment systems. in the steel standards, according to different usage requirements of the tensile properties (tensile strength, yield strength or yield point, elongation) and hardness, toughness index, as well as user requirements high, low-temperature performance, etc..) complex section steel - scalene hexagonal steel pipe, five plum-shaped steel pipe, steel double-convex, double concave steel pipe, melon-shaped steel pipe, cone-shaped steel pipe, corrugated steel pipe, steel case, other
4, according to use classification - pipes with steel pipes, thermal equipment, steel pipe, machinery and industrial steel, petroleum, geological drilling steel, container steel, chemical, industrial pipe, special-purpose steel pipes, other 4. Chemical composition of test
(1) GB3087-82 "low and medium pressure boiler seamless pipe" requirement. Chemical composition of test methods according to GB222-84 and GB223 "steel and alloy chemical analysis method" in the relevant parts.
(2) GB5310-95 "high-pressure boiler seamless steel pipe" requirement. Chemical composition of test methods according to GB222-84 and the "steel and alloy chemical analysis method", GB223 "steel and alloy chemical analysis method" in the relevant parts.
(3) The import of the chemical composition of boiler tube inspection according to the criteria stipulated in the contract
At present, the world's total production of steel pipes are more than 110 countries, more than 1850 companies under more than 5100 manufacturing plants, including oil production tube 44 countries, more than 170 companies under the more than 260 plants. In 2000, apparent consumption of seamless steel pipe China 4.18 million tons, of which domestic supply of 3.821 million tons, accounting for 91.4% of total domestic demand. Imported 35.9 million tons, accounting for 8.59% of total domestic demand. The same year, consumption of oil pipe of about 91 million tons. Imported about 2.52 million tons. Imports of pipe total domestic consumption of about 70%, of which imports of pipe total domestic consumption accounted for 27.69%, oil pipe seamless steel pipe imports total imports accounting for about 70%. Oil pipe imported from Japan accounted for more than half of total imports. China's largest production base of oil casing - Tianjin Steel Tube Company's steel products in 2000 came to 522,000 tons, of which oil production was 364.1 thousand tons casing. Casing the country's total oil production of more than half. In the production and sales are accounted for on the tube market in China first.











































form: seamless steel pipe