(1) seamless steel pipe
Because of its manufacturing process, it is divided into hot-rolled (extrusion) seamless steel pipe and cold-drawn (rolled) seamless steel pipe two. Cold-drawn (rolled) tube is also divided into two kinds of round and shaped tube.
a. Process Overview
Hot Rolled (Extruded Seamless Steel Pipe): round billet → heating → piercing → three-roll tilting, continuous rolling or extrusion → de-tubing → sizing (or reduction) → cooling → billet → straightening → hydrostatic test (or flaw detection) → marking → storage.
Cold-drawn (rolled) seamless steel pipe: round billet→heating→piercing→heading→annealing→acid washing→oil coating (copper plating)→multiple cold-drawn (cold-rolled)→billet pipe→heat treatment→straightening→hydraulic test (flaw detection)→marking→storage.
b. Seamless steel pipe, due to its different uses and is divided into the following varieties:
GB/T8162-1999 (structural seamless steel pipe). Mainly used for general structure and mechanical structure. Its representative material (grade): carbon steel 20, 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc..
GB/T8163-1999 (seamless steel pipe for transportation of fluids). Mainly used in engineering and large-scale equipment to transport fluid pipelines. Representative material (grade) for 20, Q345, etc..
GB3087-1999 (low and medium pressure boiler seamless steel pipe). Mainly used for industrial boilers and living boilers to transport low and medium pressure fluid piping. The representative material is 10, 20 steel.
GB5310-1995 (high-pressure boiler seamless steel pipe). Mainly used in power stations and nuclear power plant boilers on the high temperature, high pressure transportation fluid container and piping. The representative materials are 20G, 12Cr1MoVG, 15CrMoG and so on.
GB5312-1999 (seamless steel pipe of carbon steel and carbon manganese steel for ships). Mainly used for ship boilers and superheaters with I, II level pressure-resistant pipe and so on. The representative material is 360, 410, 460 steel grade.
GB1479-2000 (high-pressure fertilizer equipment with seamless steel pipe). Mainly used for fertilizer equipment to transport high temperature and high pressure fluid pipeline. The representative materials are 20, 16Mn, 12CrMo, 12Cr2Mo and so on.
GB9948-1988 (seamless steel pipe for oil cracking). Mainly used in petroleum refineries, boilers, heat exchangers and their pipelines for the transportation of fluids. Its representative materials are 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb and so on.
GB18248-2000 (seamless steel pipe for gas cylinder). Mainly used for making all kinds of gas, hydraulic cylinders. Its representative materials are 37Mn, 34Mn2V, 35CrMo and so on.
GB/T17396-1998 (hot rolled seamless steel pipe for hydraulic strut). Mainly used in the production of coal mine hydraulic support and cylinder, column, and other hydraulic cylinder, column. Its representative materials are 20, 45, 27SiMn and so on.
GB3093-1986 (high pressure seamless steel pipe for diesel engine). Mainly used for diesel injection system high-pressure oil pipe. Its steel pipe is generally cold-drawn pipe, and its representative material is 20A.
GB/T3639-1983 (cold-drawn or cold-rolled precision seamless steel pipe). Mainly used for mechanical structure, carbon pressure equipment, requiring high dimensional accuracy, good surface finish of the steel pipe. Its representative material 20, 45 steel and so on.
GB/T3094-1986 (cold-drawn seamless steel pipe shaped steel pipe). Mainly used in the production of various structural components and parts, its material for high-quality carbon structural steel and low alloy structural steel.
GB/T8713-1988 (Precision I.D. Seamless Steel Tubes for Hydraulic and Pneumatic Cylinders). Mainly used in the production of hydraulic and pneumatic cylinder barrel with precision internal diameter size of the cold drawn or cold rolled seamless steel tube. Its representative material is 20, 45 steel and so on.
GB13296-1991 (stainless steel seamless steel pipe for boilers and heat exchangers). Mainly used in chemical enterprises, boilers, superheaters, heat exchangers, condensers, catalytic tubes and so on. Used for high temperature, high pressure, corrosion-resistant steel pipe. Its representative materials are 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti and so on.
GB/T14975-1994 (structural stainless steel seamless steel pipe). Mainly used for general structure (hotel, restaurant decoration) and chemical enterprise mechanical structure with atmospheric and acid corrosion resistance and have a certain strength of the steel pipe. Its representative materials are 0-3Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti and so on.
GB/T14976-1994 (stainless steel seamless steel pipe for fluid transportation). Mainly used for piping corrosive media. The representative materials are 0Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr17Ni12Mo2, 0Cr18Ni12Mo2Ti and so on.
YB/T5035-1993 (seamless steel pipe for automobile half shaft casing). Mainly used in the production of automotive half shaft casing and drive axle shell shaft tube with high quality carbon structural steel and alloy structural steel hot rolled seamless steel pipe. Its representative materials are 45, 45Mn2, 40Cr, 20CrNi3A and so on.
API SPEC5CT-1999 (casing and tubing specification), is the American Petroleum Institute (American Petreleum Instiute, referred to as "API") compiled and released in the world common. Casing: Tubing that extends from the surface of the ground into the drilled well as a wall liner, with the tubing connected to each other by clamps. The main materials are steel grades such as J55, N80 and P110, as well as C90 and T95 which are resistant to hydrogen sulfide corrosion. Its low steel grade (J55, N80) can be welded steel pipe. Oil pipe: the pipe inserted into the casing from the ground surface up to the oil layer, which is connected between the pipes through the joints or the whole. Its role is to pump the oil layer oil through the oil pipe to the ground. The main materials are J55, N80, P110, and hydrogen sulfide corrosion-resistant C90, T95 and other steel grades. Its low steel grade (J55, N80) can be welded steel pipe.
API SPEC 5L-2000 (pipeline pipe specification), is the American Petroleum Institute compiled and released in the world.
Line pipe: is the shaft out of the ground oil, gas or water, through the pipeline pipe to the oil and gas industry enterprises. Line pipe includes seamless and welded pipe two kinds, its pipe end has a flat end, with threaded end and socket end; its connection for the end of the welding, hoop connection, socket connection and so on. The main materials of the pipe are B, X42, X56, X65, X70 and other steel grades.
(2) Welded steel pipe
Welded steel pipe billet is a steel plate or strip, because of its welding process is divided into furnace welding pipe, electric welding (resistance welding) pipe and automatic arc welding pipe. Because of its welding form is divided into straight seam welded pipe and spiral welded pipe two kinds. Because of its end shape is divided into round welded pipe and shaped (square, flat, etc.) welded pipe. Welded pipe is divided into the following varieties because of its different materials and uses:
GB/T3091-1993 (low-pressure fluid transport galvanized welded steel pipe). Mainly used for the transportation of water, gas, air, oil and heating hot water or steam and other general lower pressure fluid and other purposes. Its representative material Q235A grade steel.
GB/T3092-1993 (galvanized welded steel pipe for low-pressure fluid transport). Mainly used for the transportation of water, gas, air, oil and heating hot water or steam and other general low-pressure fluids and other purposes. Its representative material: Q235A grade steel.
GB/T14291-1992 (welded steel pipe for fluid transportation in mines). Mainly used for mine pressure wind, drainage, shaft gas discharge with straight seam welded steel pipe. Its representative material Q235A, B-grade steel. GB/T14980-1994 (low-pressure fluid transportation with large diameter welded steel pipe). Mainly used for conveying water, sewage, gas, air, heating steam and other low-pressure fluids and other purposes. Its representative material Q235A grade steel.
GB/T12770-1991 (stainless steel welded steel pipe for mechanical structure). Mainly used for machinery, automobiles, bicycles, furniture, hotels and restaurants decoration and other mechanical parts and structural components. Its representative material 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb and so on.
GB/T12771-1991 (stainless steel welded steel pipe for fluid transportation). Mainly used for conveying low-pressure corrosive media. The representative materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2 and so on.