Stainless Steel 321 Fittings, UNS S32100 Fittings Supplier & Exporter

GENERAL PROPERTIES:-

Alloy 321 (UNS S32100) is a titanium stabilized austenitic stainless steel with good general corrosion resistance. It has excellent resistance to intergranular corrosion after exposure to temperatures in the chromium carbide precipitation range of 800 – 1500°F (427 – 816°C). The alloy resists oxidation to 1500°F (816°C) and has higher creep and stress rupture properties than alloys 304 and 304L. It also possesses good low temperature toughness.

Alloy 321H (UNS S 32109) is the higher carbon (0.04 – 0.10) version of the alloy. It was developed for enhanced creep resistance and for higher strength at temperatures above 1000oF (537°C). In most instances, the carbon content of the plate enables dual certification.

Alloy 321 cannot be hardened by heat treatment, only by cold working. It can be easily welded and processed by standard shop fabrication practices.

APPLICATIONS:-

• Aerospace – piston engine manifolds
• Chemical Processing
• Expansion Joints
• Food Processing – equipment and storage
• Petroleum Refining – polythionic acid service
• Waste Treatment – thermal oxidizers

CORROSION RESISTANCE:-

• exhibits good general corrosion resistance that is comparable to 304.
• developed for use in the chromium carbide precipitation range of 1800 – 1500°F (427 – 816°C) .
• can be used in most diluted organic acids at moderate temperatures .
• can be used in pure phosphoric acid at lower temperatures.
• can be used in up to 10% diluted solutions at elevated temperatures.
• resists polythionic acid stress corrosion cracking in hydrocarbon service.
• utilized in chloride or fluoride free caustic solutions at moderate temperatures.
• does not perform well in chloride solutions, even in small concentrations, or in sulfuric acid service.

HOT FORMING:-

• Working temperatures of 2100 – 2300°F (1149 – 1260°C) are recommended for forging, upsetting and other hot working processes.
• Alloy not suitable for work at temperatures below 1700°F (927°C).
• Material must be water quenched or fully annealed after working to re-attain maximum corrosion resistance.

COLD FORMING:-

• Quite ductile and forms easily.

WELDING:-

• Readily welded by most standard processes.
• Post weld heat treatment is not necessary

MACHINING:-

• Hardening rate of 321 makes it less machinable than 410 stainless steel, but similar to 304

CHEMICAL PROPERTIES:-

MECHANICAL PROPERTIES

PHYSICAL PROPERTIES

Fittings and Flanges for Stainless Steel Pipe
Stainless steel piping systems can be joined by butt welding and, in the heavier 40S and 80S schedules, with threaded connections.

BUTT WELDING STAINLESS STEEL PIPE FITTINGS

Harsh steel stocks butt welding fittings in the following configuration.

• Elbows 45 degree and 90 degree - long radius and short radius.
• Return bends 180 - long radius and short radius.
• educers - concentric and eccentric.
• Tees - equal and reducing.
• Caps.
• Stub ends - Type B.

Advantages of stainless steel butt Weld fitting to the pipe are to keep pipes permanently leak proof. The continuous structure helps strength between pipes and fittings. It reduces pressure and also minimises the action of corrosion and erosion. Butt welding fittings can be supplied in either seamless or welded construction and are covered by specifications ASTM A403M and ASTM A815M for Duplex grades.

STAINLESS STEEL SCREWED AND SOCKET WELD FITTINGs

Stainless steel piping systems can be connected using stainless steel screwed fittings - BSP threaded ("150lb") low pressure stainless steel fittings and NPT class 3000 high pressure stainless fittings in Grade 316. Socket weld fittings are used in high pressure piping systems and available in grade 316L to suit schedule 80S wall thickness piping.

MANUFACTURING SPECIFICATIONS:

• ASTM A182M (3000lb NPT and socket weld).
• ANSI B16.3 (BSP dimensions)
• ISO 4144 (BSP dimensions)

STAINLESS STEELS FITTINGS AND FLANGES:

A flange is a ring of steel (forged, cut from plate, or rolled) designed to connect sections of pipe, or to join pipe to a pressure vessel, valve, pump or other integral flanged assembly. Flanges are joined to each other by bolts, and to the piping system by welding or threading (or loose when stub ends are used). Forged stainless steel flanges are designed to the following common pressure ratings, stainless steel flanges are exported by Harsh Steel in Classes 150, 300, 600, 900, 1500 and 2500. Standard sealing face is Raised Face (RF).
The basic types of flanges are:

• Stainless steel slip-on flange
• Stainless steel socket weld flange
• Stainless steel blind flange
• Stainless steel lap joint flange
• Stainless steel weld neck flange
• Stainless steel threaded flange
• Stainless steel orifice Flange

Manufacturing specification: ASTM A182M
Plate stainless steel flanges are cut and machined from plate - Table 'D', Table 'E', etc.
Manufacturing specification: AS2129.
Types and applications of Stainless steel and Nickel alloy flanges

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