Carbon Steel Seamless Pipe

Carbon steel seamless pipes are made by piercing ingots or solid billets into shell pipes, and then are produced through hot - rolling, cold - rolling or cold - drawing processes. They are classified into 10# seamless steel pipes, 20# seamless steel pipes, 45# seamless steel pipes, etc. Carbon steel seamless pipes play an important role in China's steel pipe industry.

Order

022-8383 6336

Time：2024-07-23

Location：HomeProductsSeamless Steel Pipe > Carbon Steel Seamless Pipe > Carbon Steel Seamless Pipe

Overview
Features
Parameter
Application
Recommend

PRODUCT OVERVIEW

Overview

Carbon - steel seamless pipes are made by piercing ingots or solid billets into shell pipes, and then are produced through hot - rolling, cold - rolling or cold - drawing processes. They are classified into 10# seamless steel pipes, 20# seamless steel pipes, 45# seamless steel pipes, etc. Carbon - steel seamless pipes play an important role in China's steel pipe industry. According to incomplete statistics, there are currently more than about 240 seamless carbon - steel pipe production enterprises in China, with more than about 250 seamless carbon - steel pipe production lines, and the annual production capacity is about more than 4.5 million tons. In terms of diameter, those with a diameter of less than φ76 account for 35%, and those with a diameter of less than φ159 - 650 account for 25%. In terms of varieties, general - purpose pipes are 1.9 million tons, accounting for 54%; oil pipes are 760,000 tons, accounting for 5.7%; hydraulic support and precision pipes are 150,000 tons, accounting for 4.3%; stainless pipes, bearing pipes and automotive pipes total 50,000 tons, accounting for 1.4%. The raw material of carbon - steel seamless pipes is round billets. The round billets need to be cut by a cutting machine into billets with a length of about 1 meter and then sent to the furnace for heating via a conveyor belt. The billets are sent into the furnace for heating at a temperature of about 1200 degrees Celsius. The fuel is hydrogen or acetylene. Temperature control inside the furnace is a crucial issue. After coming out of the furnace, the round billets need to be pierced by a piercing machine. The more common piercing machine is the conical roll piercing machine. This kind of piercing machine has high production efficiency, good product quality, a large amount of piercing and expanding diameter, and can be used for piercing multiple steel grades. After piercing, the round billets are successively skew - rolled by three - roll mills, continuously rolled or extruded. After extrusion, the pipes need to be removed from the mandrel and sized. The sizing machine drills holes in the steel billets at high speed through conical drill bits to form steel pipes. The inner diameter of the steel pipe is determined by the outer diameter length of the sizing machine drill bit. After being sized, the steel pipe enters the cooling tower and is cooled by spraying water. After being cooled, the steel pipe needs to be straightened. After being straightened, the steel pipe is sent to a metal flaw detector (or hydraulic pressure test) for internal flaw detection via a conveyor belt. If there are problems such as cracks and bubbles inside the steel pipe, they will be detected. After quality inspection, the steel pipe still needs to go through strict manual selection. After quality inspection, the steel pipe is sprayed with numbers, specifications, production batch numbers, etc. with paint and then hoisted into the warehouse by a crane.

product features

Features

a.High strength
b.High - temperature resistant
c.High - pressure resistant
d.Corrosion - resistant

technical parameters

Parameter

Seamless steel pipes can be divided into two types, hot - rolled (extruded) seamless steel pipes and cold - drawn (rolled) seamless steel pipes, due to different manufacturing processes. Cold - drawn (rolled) pipes are further divided into circular pipes and special - shaped pipes. Seamless steel pipes are also divided into the following several varieties according to different uses: 1. Seamless Steel Pipes for Structural Purposes (GBT8162 - 2008). They are mainly used for general structures and mechanical structures. Their representative materials (grades) are: carbon steel, No. 20 and No. 45 steels; alloy steels such as Q345, 20Cr, 40Cr, 20CrMo, 30 - 35CrMo, 42CrMo, etc. 2. Seamless Steel Pipes for Fluid Conveyance (GBT8163 - 2008). They are mainly used for fluid - conveying pipelines in engineering and large - scale equipment. The representative materials (grades) are No. 20, Q345, etc. 3. Seamless Steel Pipes for Low - and Medium - Pressure Boilers (GB3087 - 2008) are high - quality carbon - structure - steel hot - rolled and cold - drawn (rolled) seamless steel pipes used for manufacturing superheated steam pipes, boiling water pipes of various low - and medium - pressure boiler structures, and superheated steam pipes, large flue pipes, small flue pipes and arch brick pipes for locomotive boilers. The representative materials are No. 10 and No. 20 steels. 4. Seamless Steel Pipes for High - Pressure Boilers (GB5310 - 2008) are high - quality carbon - steel, alloy - steel and stainless - heat - resistant - steel seamless steel pipes used for manufacturing heat - receiving surfaces of water - tube boilers with high - pressure and above. The representative materials are 20G, 12Cr1MoVG, 15CrMoG, etc. 5. Seamless Steel Pipes for High - Pressure Chemical Fertilizer Equipment (GB6479 - 2000) are high - quality carbon - structure - steel and alloy - steel seamless steel pipes suitable for chemical equipment and pipelines with a working temperature of - 40 - 400 °C and a working pressure of 10 - 30 Ma. The representative materials are No. 20, 16Mn, 12CrMo, 12Cr2Mo, etc. 6. Seamless Steel Pipes for Petroleum Cracking (GB9948 - 2006). They are mainly used for boilers, heat exchangers and their fluid - conveying pipelines in petroleum refineries. Their representative materials are No. 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb, etc. 7. Steel Pipes for Geological Drilling (YB235 - 70) are steel pipes used by geological departments for core drilling. According to different uses, they can be divided into drill rods, drill collars, core tubes, casings and sedimentation tubes, etc. 8. Seamless Steel Pipes for Diamond Core Drilling (GB3423 - 82) are seamless steel pipes for drill rods, core rods and casings used in diamond core drilling. 9. Petroleum Drill Pipes (YB528 - 65) are seamless steel pipes with internal thickening or external thickening at both ends used for petroleum drilling. Steel pipes are divided into two types: threaded and non - threaded. Threaded pipes are connected by joints, and non - threaded pipes are connected to tool joints by butt - welding. 10. Seamless Carbon Steel and Carbon - Manganese Steel Pipes for Ships (GB/5312 - 1999) are carbon - steel seamless steel pipes used for manufacturing Class I pressure - resistant piping systems, Class II pressure - resistant piping systems, boilers and superheaters on ships. The working temperature of the carbon - steel seamless steel pipe wall does not exceed 450 °C, and the working temperature of the alloy - steel seamless steel pipe wall exceeds 450 °C. The representative materials are 360, 410, 460 steel grades, etc. 11. Seamless Steel Pipes for Automobile Half - Axle Sleeves (GB3088 - 82) are high - quality carbon - structure - steel and alloy - structure - steel hot - rolled seamless steel pipes used for manufacturing automobile half - axle sleeves and drive - axle housing axle pipes. 12. High - Pressure Oil Pipes for Diesel Engines (GB3093 - 86) are cold - drawn seamless steel pipes used for manufacturing high - pressure pipes in diesel engine injection systems. 13. Precision Inner - Diameter Seamless Steel Pipes for Hydraulic and Pneumatic Cylinders (GB8713 - 88) are cold - drawn or cold - rolled precision seamless steel pipes with precise inner - diameter dimensions used for manufacturing hydraulic and pneumatic cylinders. 14. Cold - Drawn or Cold - Rolled Precision Seamless Steel Pipes (GB3639 - 83) are cold - drawn or cold - rolled precision seamless steel pipes with high - dimensional accuracy and good - surface - finish used for mechanical structures and hydraulic equipment. Using precision seamless steel pipes to manufacture mechanical structures or hydraulic equipment can greatly save machining time, improve material utilization rate, and at the same time is conducive to improving product quality. 15. Stainless - Steel Seamless Steel Pipes for Structural Purposes (GB/T14975 - 2002) are hot - rolled (extruded, expanded) and cold - drawn (rolled) seamless steel pipes made of stainless steel, which are widely used for corrosion - resistant pipelines, structural members and parts in chemical, petroleum, light - textile, medical, food, mechanical and other industries. 16. Stainless - Steel Seamless Steel Pipes for Fluid Conveyance (GB/T14976 - 2002) are hot - rolled (extruded, expanded) and cold - drawn (rolled) seamless steel pipes made of stainless steel used for conveying fluids. 17. Special - Shaped Seamless Steel Pipes are the general term for seamless steel pipes with cross - sectional shapes other than circular pipes. According to different cross - sectional shapes and sizes of steel pipes, they can be further divided into special - shaped seamless steel pipes with equal wall thickness (code - named D), special - shaped seamless steel pipes with unequal wall thickness (code - named BD), and special - shaped seamless steel pipes with variable diameters (code - named BJ). Special - shaped seamless steel pipes are widely used for various structural members, tools and mechanical parts. Compared with circular pipes, special - shaped pipes generally have larger moments of inertia and section moduli, and greater bending and torsional resistance capabilities, which can greatly reduce the structural weight and save steel. 18. Seamless Steel Pipes for Gas Cylinders (GB18248 - 2000). They are mainly used for making various gas and hydraulic gas cylinders. Their representative materials are 37Mn, 34Mn2V, 35CrMo, etc. In addition, there are also GB/T17396 - 1998 (Hot - Rolled Seamless Steel Pipes for Hydraulic Pillars), GB3093 - 1986 (High - Pressure Seamless Steel Pipes for Diesel Engines), GB/T3639 - 1983 (Cold - Drawn or Cold - Rolled Precision Seamless Steel Pipes), GB/T3094 - 1986 (Cold - Drawn Special - Shaped Seamless Steel Pipes), GB/T8713 - 1988 (Precision Inner - Diameter Seamless Steel Pipes for Hydraulic and Pneumatic Cylinders), GB13296 - 1991 (Stainless - Steel Seamless Steel Pipes for Boilers and Heat Exchangers), GB/T14975 - 2002 (Stainless - Steel Seamless Steel Pipes for Structural Purposes), GB/T14976 - 2002 (Stainless - Steel Seamless Steel Pipes for Fluid Conveyance), GB/T5035 - 1993 (Seamless Steel Pipes for Automobile Half - Axle Sleeves), API SPEC5CT - 1999 (Specification for Casing and Tubing), etc.

application field

Application