Stainless Steel Seamless Pipe for Industrial Applications

Stainless Steel Seamless Pipe

Our Stainless Steel Seamless Pipe is manufactured with precision to ensure uniform strength and durability, suitable for high-pressure and high-temperature applications in industrial settings.

As the global manufacturing industry transforms to green and intelligent direction, the manufacturing process of stainless steel seamless pipe continues to break through, the application scenarios continue to expand, and its technical standards and market demand have ushered in a new round of changes.

This paper will analyze the manufacturing process and performance advantages of this key material, and provide systematic reference for industry practitioners and researchers.

I. Core Characteristics and Industrial Value of Stainless Steel Seamless Tubes

(1) Definition and Basic Classification

Stainless steel seamless tubes are a kind of long steel with a hollow cross-section and no peripheral seams, which have excellent corrosion resistance, high temperature resistance and mechanical properties. According to the different metallographic organizations, stainless steel seamless pipe can be divided into the following categories:

A. Austenitic stainless steel seamless pipe: such as 304, 316, etc., with good corrosion resistance, formability and weldability, suitable for a variety of industrial environments.

B. Seamless martensitic stainless steel tubes: with high strength and wear resistance, suitable for high hardness and high strength requirements of the scene.

C. Duplex stainless steel seamless pipe: combining the advantages of austenitic and ferritic stainless steel, with higher strength and corrosion resistance, suitable for marine engineering and chemical industry.

(2) Key Performance Advantage Analysis

A. Corrosion resistance: The corrosion resistance of seamless stainless steel pipe mainly originates from the dense oxide film formed on its surface, which can effectively resist the erosion of corrosive media such as chloride ions.

B. Mechanical strength: in high temperature and high pressure environment, seamless stainless steel pipe can maintain stable performance, suitable for petroleum, chemical and nuclear power and other fields.

C. Surface finish: its smooth surface is easy to clean and sterilize, in line with the hygiene standards of the food and pharmaceutical industries.

II. Analysis of the whole process of precision manufacturing

(1) Raw material selection and pretreatment

The metallurgical composition control of seamless stainless steel pipe is crucial, and the optimization of the ratio of chromium, nickel, molybdenum and other elements can significantly improve its corrosion resistance and strength.

(2) Comparison of core molding process

A. Hot rolling method: applicable to the production of large-diameter thick-walled pipes with high production efficiency.

B. Cold rolling/cold drawing method: mainly used for the production of high-precision thin-walled pipes, which can effectively control the surface quality and dimensional accuracy.

(3) Heat treatment and surface treatment technology

A. Solution treatment: make the alloying elements uniformly distributed through high temperature treatment to inhibit intergranular corrosion.

B. Electrolytic polishing and passivation treatment: further enhance the surface finish and corrosion resistance.

III. In-depth analysis of industry application scenarios

(1) Key requirements in the energy field

A. Oil and gas pipelines: seamless stainless steel tubes are able to effectively resist corrosive media, such as hydrogen sulfide (H₂S), to ensure the safety of oil and gas transmission.

B. Nuclear power evaporator heat transfer tube: nuclear grade stainless steel seamless tube to meet the high safety requirements of nuclear power equipment.

(2) High-end equipment manufacturing breakthroughs

A. Aeronautical hydraulic piping: balance between lightweight and high fatigue strength to meet the stringent requirements of the aviation field.

B. Semiconductor ultra-pure water system: using electrochemical polishing process to ensure high purity and pollution-free system.

IV.Common Materials

201(1Cr17Mn6Ni5N)
202(1Cr18Mn8Ni5N)
301(1Cr17Ni7)
302(1Cr18Ni)
304(0Cr18Ni9),SS304,TP304
304L(00Cr19Ni10),SS304L,TP304L
321(1Cr18Ni9Ti),SS316,TP316 316(0Cr17Ni12Mo2),SS316,TP316 316L(0Cr17Ni12Mo2),SS316,TP316 316L(0Cr17Ni12Mo2),SS316,TP316 Ni9Ti), SS321, TP321
316(0Cr17Ni12Mo2), SS316, TP316
316L(0Cr17Ni14Mo2), SS316L, TP316L
310S(0Cr25N20), SS310S, TP310S

V.Execution Standard

GB2270-80 Stainless Steel Seamless Tubes
GB/T14976-94 Stainless Steel Seamless Tubes for Fluid Conveying
GB/T14975-2012 Stainless Steel Seamless Tubes for Structural Use
GB13296-91 Stainless Steel Seamless Tubes for Boilers and Heat Exchangers
(GJB2608-96) (YB676-73) Structural Steel Thick-Walled Seamless Tubes and Pipes for Aviation Use
( GJB2296-95) (YB678-71) Stainless Steel Seamless Tubes and Pipes for Aviation
(YB/T679-97) (YB679-71) Thin-walled Seamless Steel Tubes and Pipes for 18A Hollow Rivets for Aviation
(GJB2609-96) (YB680-71) Structural Thin-walled Seamless Steel Tubes and Pipes for Aviation
(YB/T681-97) (YB681-71) Conduit for Aviation 20A Thin-walled seamless steel pipe
GB3090-2000 Stainless steel small diameter steel pipe
GB5310-95 Seamless steel pipe for high-pressure boiler
GB3087-82 Seamless steel pipe for low and medium pressure
GB3089-92 Stainless acid-resistant very thin-walled seamless steel pipe
GB9948-88 Seamless steel pipe for petroleum cracking
ASTM A213 Seamless tubes and pipes made of ferritic and austenitic alloy steels for boilers and heat exchangers ASTM A269 Seamless and Welded Steel Pipes and Tubes of Austenitic Stainless Steel for General Purposes
ASTM A312 Seamless and Welded Steel Pipes and Tubes of Austenitic Stainless Steel Welded Steel Pipes and Tubes
ASTM A450 General Requirements for Tubes and Tubes of Carbonaceous, Ferritic, and Austenitic Alloy Steels
ASTM A530 General Requirements for Special Purpose Ferritic and Alloy Steels
ASTM A789 General Requirements Carbonaceous Austenitic Stainless Steels Seamless and welded steel pipes
JIS G3456-88 Stainless steel pipes for mechanical structures
JIS G3448-88 Stainless steel pipes for general pipelines
JIS G3459-88 Stainless steel pipes for pipelines
JIS G3463-88 Stainless steel pipes for boilers and heat exchangers
Q/HYAD Seamless long steel pipes for chemical industry.

Material type	Austenitic (such as 304, 316), martensitic, duplex stainless steel.
Outer diameter range	1mm~1200mm.
Wall thickness range	0.5mm~100mm.
Tensile strength	≥450 MPa (304 material).
Yield strength	≥210 MPa (304 material).
Elongation	≥35% (heat treatment condition).
Corrosion resistance	Excellent performance in chloride environment and high temperature conditions.
Production method	Hot rolled, cold rolled/cold drawn.
Surface treatment	Pickling, passivation, electrolytic polishing.
Application areas	Petrochemical, food processing, marine engineering, nuclear power.

Specifications

Type	Classification	Specifications	Use
By OD Size	Small Diameter	6mm、8mm、10mm、12mm、14mm、16mm、18mm、20mm, etc.	Small diameter stainless steel seamless tubes are more commonly used in the manufacture of precision instruments and small piping systems that require smaller pipe diameters.
	Medium caliber	25mm、28mm、30mm、32mm、34mm、36mm、38mm、40mm、42mm、45mm、48mm、50mm、51mm、53mm、54mm、56mm、57mm、60mm、 63mm、65mm、68mm、70mm、73mm、75mm、76mm、80mm、83mm、89mm、95mm, etc.	Seamless stainless steel tubes of medium caliber are widely used in general industrial piping, decorative projects and so on.
	Large caliber	102mm、108mm、114mm、121mm、127mm、133mm、140mm、146mm、152mm、159mm、168mm、180mm、194mm、219mm、245mm、273mm、 325mm、351mm、377mm、426mm、456mm、530mm、630mm, etc.	Large caliber stainless steel seamless pipe is mainly used in large-scale petrochemical pipelines, city water supply and gas supply pipelines and other projects.
By Wall Size	Thin Wall	Wall thicknesses are usually 0.5mm、0.6mm、0.8mm、1.0mm、1.2mm、1.4mm、1.5mm、1.6mm、2.0mm、2.2mm	Thin-walled stainless steel seamless pipe is used in some of the weight requirements, and bear relatively small pressure, such as part of the food and beverage transportation pipeline.
	Medium thick wall	Wall thicknesses are usually2.5mm、2.8mm、3.0mm、3.2mm、3.5mm、4.0mm、4.5mm、5.0mm、 5.5mm、6.0mm、6.5mm、7.0mm、7.5mm、8.0mm、8.5mm、9.0mm、9.5mm、10mm。	This type of pipe is used in a wide range of applications, from ordinary industrial piping to some civil construction piping with certain requirements for strength and corrosion resistance.
	Thick-walled	Wall thicknesses are usually 11mm、12mm、13mm、14mm、15mm、16mm、18mm、20mm、25mm、30mm、35mm、40mm、45mm、50mm等。	Thick-walled stainless steel seamless pipe can withstand large pressure and external forces, commonly used in high-pressure piping systems, large mechanical structural components and so on.
By length dimension		6m、12m	Can be customized to meet specific requirements.

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