Alloy steel is a series of alloy steel which its main content is steel.
By adding different metal elements with different ratios in steel, it can change the mechanical properties of alloy steel.
Alloy steel tubes are ideally suitable for chemical, petrochemicals, and other energy-related applications.
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 steel can be used in process area where carbon steel has limitation such as
l High-temperature services
l Low-temperature services
l High presser service
As an important element of steel products, alloy steel tubes can be divided into seamless steel pipe and welded steel pipe according to the manufacturing technique and tube billet shape. Here are some frequently-used alloy steel grades that you will come across.
16Mn/40Mn2, 45Mn2, 27SiMn, 20Cr, 40Cr, 20CrMo, 35crMo, 38CrMoAl, 50CrV, 30CrMnSi, A335P11, P91, P92, 15CrMoG, 12Cr1MoVG, 1Cr5Mo, Cr5Mo, Cr9Mo, 0Cr9Mo, 15CrMo, 12Cr1MoV, 10CrMo910, A335P91, 1Cr2Mo, 15MnV, 37Mn5, 10Cr9Mo1VNb, 15NiCuMoNb5, 12Cr2MoWVTiB, WB36, SA106B, ST45.8-III;
Ordinary carbon steel high pressure boiler tube GB5310: 20G, 20MG, 25MG, 15MoG, 20MoG and above are commonly used alloy steel pipe materials.
Frequently-used Norms for Alloy Steel Pipes:
l GB/T8162 - Seamless Steel Tubes for Structural Purposes (Chinese national standard)
l GB/T6479-Seamless steel tubes for high-pressure chemical fertilizer equipments
l GB/T9948-Seamless steel tubes for petroleum cracking
l GB5310-Seamless steel tubes and pipes for high pressure boiler
l ASME SA210-Specification for Seamless Medium-carbon Steel Boiler and Super-heater Tubes
l ASME SA213-Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
l DIN17175-Heat-resisting Seamless Steel Tube Used for Pipelines of Boiler Industry
More Norms for Pipes, Tubes and Hollow Sections:
l ASTM A 53 - Black and Hot-Dipped, Zinc-Coated, Welded and Seamless, Steel Pipe
l ASTM A 106 - Seamless Carbon Steel Pipe for High-Temperature Service
l ASTM A 213 - Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
l ASTM A 312 - Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
l ASTM A 333 - Seamless and Welded Steel Pipe for Low-Temperature Service
l ASTM A 335 - Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
l EN 10210-1/2 - Hot finished structural hollow sections of non-alloy and fine grain steels
l EN 10216-1 - Seamless steel tubes for pressure purposes - Part 1: Non-alloy steel tubes with specified room temperature properties
l EN 10216-2 - Seamless steel tubes for pressure purposes - Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties
l EN 10217-1 - Welded steel tubes for pressure purposes - Part 1: Non-alloy steel tubes with specified room temperature properties
l EN 10217-2 - Welded steel tubes for pressure purposes - Part 2: Electric welded non-alloy and alloy steel tubes with specified elevated temperature properties
l EN 10305-1 Steel tubes for precision applications- Technical delivery conditions- Part 1: Seamless cold drawn tubes
l EN 10305-2 Steel tubes for precision applications- Technical delivery conditions- Part 2: Weld cold drawn tubes
l EN 10305-2 Steel tubes for precision applications- Technical delivery conditions- Part 3: Welded cold sized tubes
l GB/T 3639 Seamless Cold drawn or cold rolled steel tubes for precision applications
l DIN 2391 Seamless Precision Steel tubes- Part 1: Dimensions
l DIN 2391 Seamless Precision Steel tubes- Part 2: Technical delivery conditions