ASTM A312 Seamless Stainless Steel Pipe / Tube

The company is a modern chemical plant integrating research, development, production, processing, sales and distribution of stainless steel bright seamless tubes, and has become one of the large-scale production and processing plants of stainless steel tubes in East China. Provide safe and reliable stainless steel pipe for industry.

Production base No. 1 is located in Zhangguo Industrial Science and Technology Park, Xinghua City, Taizhou City, China's Stainless Steel City. After three years of rapid development, the company established production base No. 2 in the same area in 2019.

Specializing in the production of stainless steel BA/EP tubes, stainless steel precision seamless tubes, stainless steel bright seamless tubes, stainless steel heat exchange tubes, stainless steel clean tubes, customized tubes, etc.

The materials are mainly 304, 304L, 316L, 321, 347H, 310S, 904L, 2205, 2520, 2507, C276, etc.

The products are widely used in mechanical equipment, automobile manufacturing, shipbuilding industry, metal machining, hydraulic equipment, semiconductor, photovoltaic, instrumentation, biomedicine, food industry, aerospace, petrochemical, pressure vessels, heat exchangers, automatic industrial rail transit, high-pressure boilers, water conservancy and power and other industries.

The company strictly follows ASTM A269/ASTM A270/ASME-BPE/EN10216-5/EN10305-1/ISO 1127 standards to organize research, development, production, control and sales of stainless steel seamless tubes. The main production equipment is LD-80 multi roll cold rolling pipe mill, LG-60-SG full-automatic cold rolling pipe mill, LG-40-SG full-automatic cold rolling pipe mill, LD50, LD-30, LG-20-H cold rolling pipe mill, LB-15T oil drawing machine, 1080 vacuum bright annealing furnace, and other complete sets of stainless steel pipe production lines. It has advanced steel pipe quality testing equipment and technology such as eddy current testing, hydraulic testing, spectral testing, hardness testing, etc.

To establish a long-term integrity and achieve immortality through quality: we take high quality, high efficiency and credit as our business philosophy. Solve the customer's worries and solve problems from the customer's perspective. Keep looking at yourself and the needs of the industry!



The multi roll cold rolling mill equipped in Jiangsu Jiangsu Metal Technology Co., Ltd. is the key equipment for manufacturing sanitary seamless stainless steel pipes. With the cold drawn steel pipe as the blank, the error between the internal and external diameters of the cold rolled pipe and the wall thickness shall be ± (0.02 ~ 0.05) mm, and the internal and external surface finish of the pipe (R a) ≤ 0.8 μ m. The tube can be made to a wall thickness of 0.8mm, and then polished. The internal and external surface finish (Ra) of the tube can reach 0.2~0 four μ m .

The defect of the cold rolled tube is hard, that is, the yield coefficient is large, and it is not suitable for flaring and bending, so the hot melt treatment (annealing) should be carried out. In general, after the stainless steel pipe is treated in an ordinary thermosetting furnace (milk stove), the inner and outer surfaces of the pipe will show oxide skin and need to be pickled, which will damage the internal and outer surface finish of the original cold-rolled pipe and cause minor unevenness, which cannot meet the surface finish standard of sanitary grade pipe. Therefore, the gas shielded bright annealing furnace should be selected.

The gas shielded bright annealing furnace is composed of bright annealing furnace body and complete ammonia decomposition device.

(1) The main structure of the bright annealing furnace body is a round section muffle tank. The heating method of arranging high temperature heating wires on both sides and at the bottom is adopted. The ammonia decomposition gas is used as the protective gas and circulating cooling gas. The equipment has compact structure, safe operation, reliable control, convenient maintenance and uniform furnace temperature (up to 1150 ºC); Low power loss, full use of shielding gas, fast cooling speed, which can prevent the re precipitation and precipitation of chromium carbide, so that all chromium carbide can be completely dissolved into the austenitic matrix, changing the hardness and metallographic structure of the original cold-rolled tube, and truly achieving the purpose of solid melting treatment.

(2) The complete ammonia decomposition unit decomposes pure liquid chlorine into 70% hydrogen and 30% ammonia, which are filled into the furnace body to drive away air (oxygen). The less air, the better. After being treated by the gas shielded bright annealing furnace, the stainless steel pipe is soft, and there are few oxide scales on the internal and external surfaces, so pickling is not required, and the internal and external surface finish of the cold rolled pipe can be maintained.