Since the inquiry is a tender, we fully supported our customer while end user proposed new demand, such as COC certificate etc. In this process, both of us treated seriously and check each item carefully when there’s update. Thankfully, we won the bid and got order 2 months later.

Alloy steel is widely used in high-demand fields such as petroleum, natural gas, chemical industry, electric power, boiler, nuclear energy, shipbuilding, machinery manufacturing, etc. due to its excellent high-temperature strength, corrosion resistance and pressure resistance. ZIZI professionally provides a full range of alloy steel pipes, pipe fittings and flanges to meet the stringent requirements of different industries for strength, temperature and pressure.

Product List

Alloy Steel Pipes Inspection photos

Alloy Steel Pipes Fittings Inspection photos

Alloy Steel Flanges Inspection photos

Alloy Steel Pipe Specification

ASTM A335 Alloy Steel Pipe Chemical Composition

ASTM A335 Alloy Steel Pipe Mechanical Property

Features

High strength and toughness: Able to withstand greater pressure and external impact.

Excellent temperature resistance: Can maintain sufficient strength and creep resistance at high temperatures, and still maintain good toughness at low temperatures, and is not prone to brittle fracture.

Excellent corrosion resistance: By adding elements such as chromium and nickel, the oxidation resistance and corrosion resistance are significantly improved.

Good weldability and processability: Most alloy steel pipes have good welding performance and are easy to carry out subsequent processing and installation.

Alloy Steel Pipes Fittings Specification

Classification of Alloy Steel Pipe Fittings

1. Classification by product type

This is the most common classification method, which is distinguished according to the function and shape of the pipe fittings:

Threaded Fittings:

Features: The pipe fittings have threads inside or outside, and are connected to the pipe by screwing with threads. Installation and removal are convenient and quick, and no welding is required.

Common types: Threaded elbows, threaded tees, threaded nipples, threaded couplings, threaded unions, threaded plugs, etc.

Socket-Weld Fittings:

Features: The pipe fittings have a socket at one or both ends. After the pipe is inserted into the socket, it is connected by external fillet welding.

Common types: Socket-Weld elbows, socket-Weld tees, socket-Weld reducers, socket-Weld couplings, socket-Weld unions, socket-Weld pipe caps, etc.

Alloy Steel Flanges Specification 

ASTM A182 Alloy Steel Pipe Fittings & Flanges Chemical Composition

ASTM A182 Alloy Steel Pipe Fittings & Flanges Mechanical Property

Alloy Steel Flanges Types:

Welding Neck Flange

Slip On Flange

Socket Weld Flange

Threaded Flange

Blind Flange

Lap Joint Flange

Dimensions and Standards

The dimensions of alloy steel pipes, fittings and flanges also follow strict international and national standards to ensure interchangeability and system compatibility. The main standards include:

Pipes: ASTM A335 (seamless ferritic alloy steel pipes for high temperature applications), ASTM A213 (seamless ferritic and austenitic alloy steel pipes for boilers, superheaters and heat exchangers), etc.

Fittings: ASME B16.9 (factory-made butt-weld fittings), ASME B16.11 (socket-weld and threaded forged fittings), etc.

Flanges: ASME B16.5 (pipe flanges and flange fittings, sizes NPS 1/2 to NPS 24), ASME B16.47 (large diameter steel flanges, sizes NPS 26 to NPS 60), etc.

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