Stainless Steel 301 Fittings, UNS S30100 Fittings Supplier & Exporter

GENERAL PROPERTIES:-

Stainless steel grade 301 is a commonly available austenitic stainless with good corrosion resistance and elevated carbon to allow for cold working to a variety of tempers. It can be obtained in the 1/4 hard, 1/2 hard, and full hard.

APPLICATIONS:-

High strength and excellent corrosion resistance make Type 301 Stainless Steel useful for a wide variety of applications. Typical uses include:

• aircraft structural parts
• trailer bodies
• utensils
• architectural and automotive rim
• roof drainage products
• conveyor belts
• variety of industrial applications.

CORROSION RESISTANCE:-

• Good resistance in applications involving external exposure to mildly corrosive conditions at ambient temperatures.
• Resists outdoor, industrial, marine, and mild chemical environments
• susceptible to carbide precipitation during welding, which restricts its use in some applications
• Similar to resistance of Stainless Steel grade 304

HEAT RESISTANCE:-

• Can be exposed continuously without appreciable scaling to a max of 1600°F(871°C).
• Maximum exposure temperature is about 1450°F (788°C), for intermittent exposure
• Has an oxidation weight gain of 10mg/cm 2 in 1,000 hours, in temperatures over 1600°F (871°C).

HEAT TREATMENT:-

• Solution Treatment (Annealing) – Heat to 1010-1120°C and cool rapidly.
• Use low side of range for intermediate annealing.
• This grade cannot be hardened by thermal treatment.

COLD WORKING:-

• hardens at high rate, creating a very high strength from cold rolling and from roll forming.
• more difficult to work than other austenitic stainless steels, due to its high work hardening rate..
• strain-hardened austenitite steel undergoes partial transformation into martensitite steel during this process.
• severe cold deformation can still occur, due to residual ductility.
• Grade 301 becomes strongly magnetic when cold rolled.

WELDING:-

• must be annealed for maximum corrosion resistance
• more difficult to work than other austenitic stainless steels, due to its high work hardening rate..
• must be annealed for maximum corrosion resistance
• Welding and post weld annealing will both remove high strength induced by prior cold rolling.
• Spot welding is commonly used to assemble cold rolled 301 components..
• material will lose temper in the heat affected weld zone.

CHEMICAL PROPERTIES:

%		Cr	Ni	C	Si	Mn	P	S	N
301	Min:	16	6	-	-	-	-	-	-
	Max:	18	8	0.15	1.00	2.0	0.045	0.030	0.10

MECHANICAL PROPERTIES:

Grade/Temper	Tensile Strength ksi (min.)	Yield Strength 0.2% ksi (min.)	Elongation -% in 50 mm (min.)
301 1/4	125	75	25
301 1/2	150	110	18
301 Full Hard	185	140	9

PHYSICAL PROPERTIES:

Denstiy lbm/in3	Coefficient of Thermal Expansion (min/in)-°F			Electrical Resistivity mW-in						Thermal Conductivity BTU/hr-ft-°F	Melting Range
0.29	at 68 – 212°F	at 68 – 932°F	at 68 – 1450°F	at 68°F	at 212°F	at 392°F	at 752°F	at 1112°F	at 1472°F	at 68 – 212°F	2550-2590°F
	9.2	10.4	10.9	28.3	30.7	33.8	39.4	43.7	47.6	9.4

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

Slip-on flanges	The flange is slipped over the pipe and then welded both inside and outside to provide sufficient strength and prevent leakage. Slip-on flanges are also used as loose back-up flanges when stub ends are used.
Blind flanges	This is a flange without a centre bore, used to shut off a piping system or vessel opening
Weld neck flanges	This is a flange without a centre bore, used to shut off a piping system or vessel opening
Lap joint flanges	This is again similar to a slip-on flange, but has a radius at the intersection of the centre bore and the flange face to accommodate a lap stub end.

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