Q255 Q235 Seamless carbon steel pipe
Seamless Structure for Superior Strength – Unlike welded pipes, seamless carbon steel pipes have no joints or seams around the body, which provides higher uniformity, durability, and resistance to pressure.
Versatile Manufacturing Methods – Produced through hot rolling, cold rolling, or cold drawing processes, these pipes can meet different technical requirements and adapt to a wide range of applications.
Availability in Multiple Forms – Seamless steel pipes are offered in both hot-rolled (extruded) and cold-drawn (rolled) categories, ensuring flexibility for industries with varied operational needs.
Wide Range of Shapes and Sizes – In addition to standard round pipes, cold-drawn seamless pipes are also available in special-shaped designs, making them suitable for customized engineering and structural projects.
Seamless carbon steel pipe is a kind of capillary pipe made of steel ingot or solid billet through perforation, and then hot rolled, cold rolled or cold drawn. There are no seams around the steel pipe. Seamless steel pipes can be divided into hot-rolled (extruded) seamless steel pipes and cold-drawn (rolled) seamless steel pipes. Cold drawn (rolled) seamless steel pipes are divided into round pipes and special-shaped pipes.
Specifications and classification of seamless steel pipes
According to the production process classification: hot-rolled (extruded) seamless steel pipe and cold-drawn (rolled) seamless steel pipe. Cold drawn (rolled) seamless steel pipes are further divided into round pipes and special-shaped pipes.
According to different uses, it is divided into:
Name | Standard | Representing material (grade) | Application |
General seamless carbon steel pipe | 10, 20, 30, 35, 45 and other high-quality carbon steel, 16Mn, 5MnV and other low-alloy structural steel, 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steel | Seamless pipes made of low carbon steel such as 10 and 20 are mainly used for fluid transportation pipelines. 45, 40Cr and other medium carbon steel seamless pipes are used to manufacture mechanical parts, such as the stressed parts of automobiles and tractors. | |
Structural seamless steel pipes | GBT8162-2008 | Carbon steel, 20, 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc. | For general construction and mechanical construction. |
Seamless steel pipes for conveying fluids | GBT8163-2008 | 20, Q345, etc. | It is used for conveying fluid pipelines in engineering and large-scale equipment. |
Seamless steel pipes for low and medium pressure boilers | GB3087-2008 | 10, 20 steel | Hot-rolled and cold-drawn (cold-rolled) high-quality carbon structural steel used in the manufacture of superheated steam pipes, boiling water pipes, and superheated steam pipes, large smoke pipes, small smoke pipes and arch brick pipes for low and medium pressure boilers of various structures Seamless steel pipe. |
Seamless steel pipe for high pressure boiler | GB5310-2008 | 20G、12Cr1MoVG、15CrMoG | High-quality carbon steel, alloy steel and stainless heat-resistant steel seamless steel pipes for the heating surface of water-tube boilers with high pressure and above. |
Seamless steel pipe for high pressure fertilizer equipment | GB6479-2000 | 20、16Mn、12CrMo、12Cr2Mo etc。 | High-quality carbon structural steel and alloy steel seamless steel pipes for chemical equipment and pipelines with working temperature of -40~400℃ and working pressure of 10~30Ma. |
Seamless steel pipe for oil cracking | GB9948-2006 | High-quality carbon steel (10, 20), alloy steel (12CrMo, 15CrMo), heat-resistant steel (12Cr2Mo, 15Cr5Mo), etc. | Boilers, heat exchangers and their pipelines for conveying fluids in oil refineries. |
Steel pipe for geological drilling | YB235-70 | DZ40, DZ50, DZ60, R780, etc. | It is a steel pipe used by the geological department for core drilling. It can be divided into drill pipe, drill collar, core pipe, casing and sedimentation pipe according to the purpose. |
Seamless steel pipe for diamond core drilling | GB3423-82 | 20# steel or 45# etc. | It is a seamless steel pipe for drill pipe, core rod and casing for diamond core drilling. |
oil drilling pipe | YB528-65 | It is used for seamless steel pipes with inner or outer thickening at both ends of oil drilling. | |
Carbon steel and carbon-manganese steel seamless pipes for ships | GB/5312-1999 | 360, 410, 460 steel grades, etc. | It is a carbon steel seamless steel pipe for the manufacture of Class I pressure-resistant piping systems, Class II pressure-resistant piping systems, boilers and superheaters. |
Seamless steel pipe for automobile half shaft casing | GB3088-82 | It is a high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipe used in the manufacture of automobile axle casings and drive axle axle casings. | |
High pressure oil pipe for diesel engine | GB3093-86 | It is a cold-drawn seamless steel pipe used in the manufacture of high-pressure pipes for diesel engine injection systems. | |
Precision inner diameter seamless steel pipes for hydraulic and pneumatic cylinders | GB8713-88 | It is a cold-drawn or cold-rolled precision seamless steel pipe with precise inner diameter for the manufacture of hydraulic and pneumatic cylinders. | |
Cold drawn or cold rolled precision seamless steel pipe | GB3639-83 | It is a cold-drawn or cold-rolled precision seamless steel pipe for mechanical structure and hydraulic equipment with high dimensional accuracy and good surface finish. | |
Shaped seamless steel pipe | It is a general term for seamless steel pipes with other cross-sectional shapes other than round pipes. According to the shape and size of the steel pipe section, it can be divided into equal-wall thickness special-shaped seamless steel pipe (code D), unequal wall thickness special-shaped seamless steel pipe (code BD), variable diameter special-shaped seamless steel pipe (code BJ). Shaped seamless steel pipes are widely used in various structural parts, tools and mechanical parts. | ||
Seamless steel pipes for gas cylinders | GB18248-2000 | 37Mn, 34Mn2V, 35CrMo, etc. | It is used to make various gas and hydraulic cylinders. |
In addition, there are GB/T17396-1998 (hot-rolled seamless steel pipe for hydraulic prop), GB3093-1986 (high-pressure seamless steel pipe for diesel engine), GB/T3639-1983 (cold drawn or cold-rolled precision seamless steel pipe), GB /T3094-1986 (cold-drawn seamless steel pipe special-shaped steel pipe), GB/T8713-1988 (precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinders), GB/T5035-1993 (seamless steel pipe for automobile axle casing), API SPEC5CT -1999 (Specification for Casing and Tubing), etc. | |||
FAQ
Q: About the price of the product
A: Due to the rise and fall of raw material prices, as well as factors such as the national power restriction policy, product prices will also fluctuate. Welcome to contact us to get the latest product price.
Q: Can you arrange shipment?
A: Of course, we have multiple warehouse locations as well as regular forwarders, and can get the best price from most shipping companies. Provide professional transportation services.
Q: How long will the delivery take?
A: Products that are in stock or only need simple processing, generally 5-15 days. If there is no stock, according to the required product quantity and the usual production time of this product, our professional sales staff will give you an approximate delivery time. According to past experience, in most cases, the delivery time will not exceed 45 days.
Q: What services do you provide?
A: 1. Provide samples, including conventional steel products and some customized steel structure products;
2. Support third-party product quality testing and provide various certificates
3. Provide pick-up and drop-off customer inspection service
4. Provide customized steel structure service
5. Provide simple steel processing, such as cutting, drilling, galvanizing, polishing and other services
6. Provide one-stop service, from product production to product transportation.
7. Provide 24 hours online service
Q: Do you provide after-sales service?
A: Yes, our company is committed to reaching long-term and friendly cooperation with customers. If you encounter any problems, please feel free to contact us.
