Stainless Steel 304LN Fittings, UNS S30453 Fittings Supplier & Exporter

INTRODUCTION:-

Stainless steel grade 304 is the most commonly used stainless steel. Stainless steel grade 304LN is a nitrogen-strengthened version of stainless steel grade 304.

The following datasheet provides an overview of grade 304LN stainless steel.

APPLICATION:-

• Heat exchangers
• Chemical industry
• Food industry
• Petroleum industry
• Fabrication industry
• Nuclear industry

CHEMICAL COMPOSITION:-

The chemical composition of grade 304LN stainless steel is outlined in the following table.

Element	Content (%)
Chromium, Cr	18-20
Nickel, Ni	8-12
Manganese, Mn	2 max
Silicon, Si	1 max
Nitrogen, N	0.1-0.16
Phosphorous, P	0.045 max
Carbon, C	0.03 max
Sulfur, S	0.03 max
Iron, Fe	Remainder

MECHANICAL PROPERTIES:-

The mechanical properties of grade 304LN stainless steel are displayed in the following table.

Properties	Metric	Imperial
Tensile strength	515 MPa	74694 psi
Yield strength	205 MPa	29732 psi
Elongation at break (in 50 mm)	40%	40%
Hardness, Brinell	217	217
Hardness, Rockwell B	95	95

OTHER DESIGNATION:-

Equivalent materials to grade 304LN stainless steel are given below.

ASTM A182	ASTM A213	ASTM A269	ASTM A312	ASTM A376
ASTM A240	ASTM A249	ASTM A276	ASTM A336	ASTM A403
ASTM A193 (B8LN, B8LNA)	ASTM A194 (8LN, 8LNA)	ASTM A320 (B8LN, B8LNA)	ASTM A479	ASTM A666
ASTM A688	ASTM A813	ASTM A814	DIN 1.4311

APPLICATION:-

Grade 304LN stainless steel is widely used in the following applications:

• Heat exchangers
• Chemical industry
• Food industry
• Petroleum industry
• Fabrication industry
• Nuclear industry

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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