Alloy steel pipes

Alloy steel pipe is a kind of seamless steel pipe, its performance is much higher than the general seamless steel pipe, because this steel pipe inside containing Cr, high temperature resistance, low temperature, corrosion-resistant performance of other non-pipe joints not match, so the more extensive use of alloy tube in the petroleum, aerospace, chemical, electric power, boiler, military, and other industries.



The alloy steel pipe adopts high quality carbon steel, alloy structural steel and stainless & heat resisting steel as raw material through hot rolling or cold drawn to be made.

Alloy pipes specification and Size

Alloy steel is a series of alloy which its main content is steel. To add different metal elements with different ratios in steel can change the mechanical properties of alloy steel.

ASTM/ ASME

American Society for Testing and Materials(ASTM), American Society of Mechanical Engineers (ASME)

Description Standard Dimension
(mm)
Steel code/ Steel grade
Carbon and alloy steel mechanical tubing, either hot-finished or cold-finished ASTM A519 20-180 x 2-30 A1, C
Seamless Ferritic and Austenitic Alloy Steel Boiler, Superheater and Heat-exchanger Tubes ASTM A213 09 10.3-426 x 1.0-36 T5, T5b, T9 , T11, T22 ,T91
Seamless Carbon and Alloy Steel for Mechanical Tubing ASTM A333 1/4"-42" x SCH20-XXS Grade1 Gr. 3,Gr..6, Gr.8 , Gr. 9
Seamless ferritic alloy-steel pipe for high-temperature service ASTM 335/335M 1/4"-42" x SCH20-XXS P5, P9 ,P11, P91, P22, P92
DIN/EN- European Standards for steel

Germany Safety(GS), Deutsches Institut für Normung(DIN)

Product name Executive standard Dimension (mm) Steel code/ Steel grade
Seamless Steel Tubes for Elevated Temperature DIN 17175 10-762 x 1.0-120 St35.8,St45.8, 10CrMo910, 15Mo3, 13CrMo44, STPL340, STB410, STB510, WB36
Seamless Ferritic Alloy Steel Pipes for High Temperature Use EN 10216-2 Ø8"-42" x WT15-100 13CrMo4-5, 1-CrMo9-10, X10CrMoVNb9-1, 15NiCuMoNb5-6-4
Seamless precision steel tube applications EN 10305-1 13.5-165.1 x 1.8-4.85 St33.2
Seamless Precision Steel Tube DIN 2391 4.0-60.0 x 0.5-8 St35, St45, St52
JIS

Japanese Industrial Standards (JIS) specifies the standards used for industrial activities in Japan.

Product name Executive standard Dimension (mm) Steel code/ Steel grade
Carbon steel/Alloy steel boiler and heat exchanger tubes JIS G3461,2 19.05-114.3 x 2.0-14 G3461(STB340, STB410, STB510)
G3462(STBA22, STBA23)
Heat resistant alloy steel pipes that are used for high temperature conveying fluid pipes for heaters and boiler tubes. JIS G3458 10.5-660.4 mm STPA 12, STPA 20, STPA 22, STPA 23, STPA 24, STPA 25, STPA 26
Honed tube

Honed tube

Honed Tubes are ready to use for hydraulic cylinder applications without further ID processing.

Boiler tubes

Boiler tubes are used in heat exchange appliances in which the energy is transferred from one medium to the other.

Boiler tubes

Alloying Elements

Commonly used alloying elements and their effects are listed in the table given below.

Alloying ElementsEffect on the Properties
Chromium Increases Resistance to corrosion   and oxidation. Increases hardenability and wear resistance. Increases high   temperature strength.
Nickel Increases hardenability. Improves   toughness. Increases impact strength at low temperatures.
Molybdenum Increases hardenability, high   temperature hardness, and wear resistance. Enhances the effects of other   alloying elements. Eliminate temper brittleness in steels. Increases high   temperature strength.
Manganese Increases hardenability. Combines   with sulfur to reduce its adverse effects.
Vanadium Increases hardenability, high   temperature hardness, and wear resistance. Improves fatigue resistance.
Titanium Strongest carbide former. Added to   stainless steel to prevent precipitation of chromium carbide.
Silicon Removes oxygen in steel making.   Improves toughness. Increases hardness ability
Boron Increases hardenability. Produces   fine grain size.
Aluminum Forms nitride in nitriding steels.   Produces fine grain size in casting. Removes oxygen in steel melting.
Cobalt Increases heat and wear   resistance.
Tungsten Increases hardness at elevated   temperatures. Refines grain size.

Q&A

Our team of experienced sales specialists proudly partners with gas and chemical processors, power generation plants, oil refineries, and related industries to offer piping components and value-added services.

The most important and desired changes in alloy steel are:

Alloy steels are made by combining carbon steel with one or several alloying elements, such as manganese, silicon, nickel, titanium, copper, chromium and aluminum. These metals are added to produce specific properties that are not found in regular carbon steel. The elements are added in varying proportions (or combinations) making the material take on different aspects such as increased hardness, increased corrosion resistance, increased strength, improved formability (ductility); the weldability can also change.

  • Increased hardenability.
  • Increased corrosion resistance.
  • Retention of hardness and strength.

Nearly all alloy steels require heat treatment in order to bring out their best properties.

Alloying Elements & Their Effects

  • Chromium – Adds hardness. Increased toughness and wear resistance.
  • Cobalt – Used in making cutting tools; improved Hot Hardness (or Red Hardness).
  • Manganese – Increases surface hardness. Improves resistance to strain, hammering & shocks.
  • Molybdenum – Increases strength. Improves resistance to shock and heat.
  • Nickel – Increases strength & toughness. Improves corrosion resistance.
  • Tungsten – Adds hardness and improves grain structure. Provides improved heat resistance.
  • Vanadium – Increases strength, toughness and shock resistance. Improved corrosion resistance.
  • Chromium-Vanadium – Greatly improved tensile strength. It is hard but easy to bend and cut.

Pipes, Tubes and Hollow Sections

Norms:
  • API 5L - Line Pipe
  • ASTM A 53 - Black and Hot-Dipped, Zinc-Coated, Welded and Seamless, Steel Pipe
  • ASTM A 106 - Seamless Carbon Steel Pipe for High-Temperature Service
  • ASTM A 213 - Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
  • ASTM A 269 - Seamless and Welded Austenitic Stainless Steel Tubing for General Service
  • ASTM A 312 - Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
  • ASTM A 333 - Seamless and Welded Steel Pipe for Low-Temperature Service
  • ASTM A 335 - Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
  • ASTM A 358 - Electric-Fusion-Welded Austenitic Chromium-Nickel Stainless Steel Pipe for High-Temperature Service and General Applications
  • ASTM A 671 - Electric-Fusion-Welded Steel Pipe for Atmospheric and Lower Temperatures
  • ASTM A 672 - Electric-Fusion-Welded Steel Pipe for High-Pressure Service at Moderate Temperatures
  • ASTM A 790 - Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe
  • ASTM A 928 - Ferritic/Austenitic (Duplex) Stainless Steel Pipe Electric Fusion Welded with Addition of Filler Metal
  • EN 10208-2 - Steel pipes for pipelines for combustible fluids - Part 2: Pipes of requirement class B
  • EN 10210-1/2 - Hot finished structural hollow sections of non-alloy and fine grain steels
  • EN 10216-1 - Seamless steel tubes for pressure purposes - Part 1: Non-alloy steel tubes with specified room temperature properties
  • EN 10216-2 - Seamless steel tubes for pressure purposes - Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties
  • EN 10217-1 - Welded steel tubes for pressure purposes - Part 1: Non-alloy steel tubes with specified room temperature properties
  • EN 10217-2 - Welded steel tubes for pressure purposes - Part 2: Electric welded non-alloy and alloy steel tubes with specified elevated temperature properties
  • EN 10219-1/2 - Cold formed welded structural hollow sections of non-alloy and fine grain steels
  • EN 10297-1 - Seamless circular steel tubes for mechanical and general engineering purposes - Part 1 Non-alloy and alloy steel tubes

Grade:

  • API 5L Gr. A, B, X42, X52, X60, X65, X70
  • ASTM A 53 Gr. A, Gr. B
  • ASTM A106 Gr. A, B, C
  • ASTM A 213 TP 304, 304L, 304H, 316, 316L, 316H, 321, 321H, T5, T9, T11
  • ASTM A 269 TP 304, 304L, 304H, 316, 316L, 316H, 321, 321H
  • ASTM A 312 TP 304, 304L, 304H, 316, 316L, 316H, 321, 321H
  • ASTM A 333 Gr. 3, Gr. 6 ASTM A 335 P1, P2, P5, P9, P11, P12, P22, P91, P92
  • ASTM A 358 TP 304, 304L, 304H, 316, 316L, 316H, 321, 321H
  • ASTM A 671 CC 60, CC 65, CC 70
  • ASTM A 672 CC 60, CC 65, CC 70
  • ASTM 790 UNS S31803, UNS S32205, UNS S32750, UNS S32760
  • ASTM A928
  • EN 10208-2 L245, L 290, L360
  • EN 10210-1 S235 JRH, S275 JOH, S275 J2H, S355 JOH, S355 J2H
  • EN 10216-1 P235 TR1/2
  • EN 10216-2 P235 GH, P265 GH
  • EN 10217-1 P235 TR1/2, P275 TR1/2
  • EN 10217-2 P235 GH, P265 GH
  • EN 10219-1 S235 JRH, S275 JOH, S275 J2H, S355 JOH, S355 J2H
  • EN 10297-1 E235, E275, E315, E355, E470


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