The greatest advantage of P22 alloy steel pipe lies in its recyclability, as it can be fully reused, aligning perfectly with the national strategies for environmental protection, energy conservation, and resource efficiency. In line with this, the government actively promotes the broader application of high-pressure alloy pipes.
Given their distinct production methods, these pipes are categorized into hot-rolled (extruded) seamless steel pipes and cold-drawn (rolled) seamless steel pipes. Cold-drawn (rolled) pipes further split into round and special-shaped tubes.
A. Overview of the process:
For hot-rolled (extruded) seamless steel pipes: round billet → heating → piercing → three-roll skew rolling, continuous rolling, or extrusion → pipe cutting → sizing (or reducing) → cooling → straightening → hydrostatic testing (or non-destructive inspection) → labeling → storage.
Cold-drawn (rolled) seamless steel pipes: round billet → heating → piercing → bulging → annealing → pickling → oiling (or copper plating) → multiple cold drawing (cold rolling) → cutting → heat treatment → straightening → hydrostatic testing (non-destructive inspection) → labeling → warehousing.
B. Seamless steel pipes vary depending on their intended use:
GB/T8162-1999 (Structural seamless steel pipe): Primarily used for general structural and mechanical applications. Representative materials include carbon steels like 20, 45, and alloy steels such as Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc.
GB/T8163-1999 (Fluid-conveying seamless steel pipe): Used in engineering projects and large-scale equipment for fluid pipeline conveyance. Representative materials include 20 and Q345.
GB3087-1999 (Low and medium-pressure boiler seamless steel pipe): Utilized in low and medium-pressure fluid pipelines for industrial and home boilers. Representative material is 10 or 20 steel.
GB5310-1995 (High-pressure boiler seamless steel pipe): Primarily used in high-temperature, high-pressure fluid headers and pipes for power plant and nuclear power plant boilers. Representative materials include 20G, 12Cr1MoVG, 15CrMoG, etc.
GB5312-1999 (Seamless steel pipe for shipbuilding): Mainly used for Class I and II pressure-resistant pipes for marine boilers and superheaters. Representative materials are 360, 410, 460 steel grades, etc.
Sales of P22 alloy steel pipes are primarily directed towards high-temperature, high-pressure pipelines.
GB9948-1988 (Petroleum-cracking seamless steel pipe): Used in boilers, heat exchangers, and transmission fluid pipelines in petroleum refineries. Representative materials include 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb, etc.
GB18248-2000 (Gas cylinder seamless steel pipe): Used to manufacture various gas and hydraulic cylinders. Representative materials are 37Mn, 34Mn2V, 35CrMo, etc.
GB/T17396-1998 (Hydraulic prop hot-rolled seamless steel pipe): Mainly used to produce hydraulic supports, cylinders, and columns in coal mines, as well as other hydraulic cylinders and columns. Representative materials are 20, 45, 27SiMn, etc.
GB3093-1986 (Diesel engine high-pressure seamless steel pipe): Used for high-pressure oil pipes in diesel engine injection systems. Generally cold-drawn, with a representative material of 20A.
GB/T3639-1983 (Cold-drawn or cold-rolled precision seamless steel pipe): Primarily used for mechanical structures and carbon pressing equipment requiring high dimensional accuracy and excellent surface finish. Representative materials are 20 and 45 steel, etc.
GB/T3094-1986 (Cold-drawn seamless steel pipe special-shaped steel pipe): Used to fabricate various structural components and parts, made from high-quality carbon structural steel and low-alloy structural steel.
GB/T8713-1988 (Precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinders): Used to produce cold-drawn or cold-rolled seamless steel pipes with precise inner diameters for hydraulic and pneumatic cylinders. Representative materials are 20 and 45 steel, etc.
GB13296-1991 (Boiler and heat exchanger stainless steel seamless steel pipe): Mainly used in boilers, superheaters, heat exchangers, condensers, catalytic tubes, etc., in chemical enterprises. High-temperature, high-pressure, and corrosion-resistant steel pipes. Representative materials include 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, etc.
GB/T14975-2002 (Structural use stainless steel seamless steel pipe): Primarily used for general structures (hotel, restaurant decoration) and mechanical structures in chemical enterprises with resistance to atmospheric corrosion, acid corrosion, and certain strength. Representative materials include 0-3Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, etc.
GB/T14976-2002 (Fluid conveying stainless steel seamless steel pipe): Mainly used for pipelines conveying corrosive media. Representative materials are 0Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr17Ni12Mo2, 0Cr18Ni12Mo2Ti, etc.
YB/T5035-1993 (Automobile axle casing seamless steel pipe): Mainly used to produce high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipes for automobile half-shaft casings and drive axle axle casings. Representative materials include 45, 45Mn2, 40Cr, 20CrNi3A, etc.
API SPEC5CT-1999 (Casing and tubing specification), compiled and published by the American Petroleum Institute (API), is widely used worldwide. Among them: Casing: A pipe extending from the ground surface into the well, serving as the lining of the well wall, with pipes connected by couplings. Main materials include J55, N80, P110, and other steel grades, as well as C90, T95, and others resistant to hydrogen sulfide corrosion. Lower-grade steels (J55, N80) can be welded pipes. Tubing: A pipe inserted from the ground surface into the oil layer, with connections via couplings or integral design. Its function is to transport oil from the oil layer to the ground using the pumping unit. Main materials include J55, N80, P110, and C90, resistant to hydrogen sulfide corrosion, prepared and released by the API, and used globally.
Line pipe: Used to transport oil, gas, or water from the ground to oil and gas industry enterprises via the line pipe. Line pipes include seamless and welded pipes. The pipe ends include flat ends, threaded ends, and socket ends; connection methods include end welding, coupling connection, and socket connection. Main material grades include B, X42, X56, X65, X70, etc.
Welded steel pipe:
The raw materials for welded steel pipes are steel sheets or strips, classified into furnace-welded pipes, electric-welded (resistance-welded) pipes, and automatic arc-welded pipes based on their welding processes. Depending on the welding form, they are divided into straight-seam welded pipes and spiral-seam welded pipes. Primarily used for conveying general low-pressure fluids such as water, gas, air, oil, and heating hot water or steam. Represents the Q235A grade steel material.
GB/T3092-1993 (Low-pressure fluid conveying galvanized welded steel pipe): Mainly used for conveying general low-pressure fluids such as water, gas, air, oil, and heating hot water or steam. Representative material is Q235A grade steel.
GB/T14291-1992 (Mine fluid transport welded steel pipe): Mainly used for straight-seam welded steel pipes for mine air pressure, drainage, and shaft discharge gases. Represents the Q235A, B grade steel materials.
GB/T14980-1994 (Large-diameter low-pressure fluid transporting electric welded steel pipe): Mainly used for conveying low-pressure fluids such as water, sewage, gas, air, and heating steam. Represents the Q235A grade steel material.
GB/T12770-1991 (Mechanical structure stainless steel welded steel pipe): Mainly used in machinery, automobiles, bicycles, furniture, hotel and restaurant decoration, and other mechanical parts and structural parts. Representative materials are 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.
GB/T12771-1991 (Corrosive medium conveying stainless steel welded steel pipe): Mainly used for conveying low-pressure corrosive media. Representative materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, etc.
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