Stainles Steel Alloy 316 Fittings

Alloys 316 (UNS S31600) and 316L (UNS S31603) are molybdenum-bearing austenitic stainless steels, which are more resistant to general corrosion and pitting/crevice corrosion than the conventional chromium-nickel austenitic stainless steels such as Alloy 304.

These alloys also offer higher creep, stress-to-rupture, and tensile strength at elevated temperatures. In addition to excellent corrosion resistance and strength properties, the Alloys 316 Fittings and 316L Fittings Cr-Ni-Mo alloys also provide excellent fabricability and formability which are typical of the austenitic stainless steels.

Alloy 316/316L Fittings (UNS S31600/S31603) is a chromium-nickelmolybdenum austenitic stainless steel developed to provide improved corrosion resistance to Alloy 304/304L in moderately corrosive environments. It is often utilized in process streams containing chlorides or halides. The addition of molybdenum improves general corrosion and chloride pitting resistance. It also provides higher creep, stress-to-rupture and tensile strength at elevated temperatures./p>

It is common practice for 316L Fittings to be dual certified as 316 and 316L. The low carbon chemistry of 316L combined with an addition of nitrogen enables 316L to meet the mechanical properties of 316. Alloy 316/316L resists atmospheric corrosion, as well as, moderately oxidizing and reducing environments. It also resists corrosion in polluted marine atmospheres. The alloy has excellent resistance to intergranular corrosion in the as-welded condition. Alloy 316/316L has excellent strength and toughness at cryogenic temperatures.

Applications

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

Benefits

Higher creep stress and rupture properties when compared with 304
Ideal for high temperature service
Overcomes sensitization and intergranular corrosion concerns
Can be used in elevated temperature applications for ASME Boiler and Pressure Vessel Code applications
Due to stabilisation the material offers better overall corrosion resistance when compared to 304/304L
Excellent mechanical properties

Chemical Composition

Grade		C	Mn	Si	P	S	Cr	MO	Ni	CU
Alloy 316	Min	-	-	-	-	-	12.0	-	-	-
Alloy 316	max	0.15	1.00	1.00	0.04	0.03	14.0	-	-	-

Mechanical Properties

Grade	Tensile Strength (MPa) min	Yield Strength 0.2% Proof (MPa) min	Elongation (% in 50mm) min	Hardness
				Rockwell B (HR B)	Brinell (HB)
Alloy 316	95,000	50,000	25	-	175

Physical Properties

Grade	Density (kg/m3)	Elastic Modulus (GPa)	Mean Coefficient of Thermal Expansion (mm/m/°C)			Thermal Conductivity (W/m.K)		Specific Heat 0-100°C (J/kg.K)	Electrical Resistivity (nW.m)
Alloy 316	–	–	0-100°C	0-315°C	0-538°C	at 100°C	at 500°C	–	–
Alloy 316	-7750	200	10.4	11.0	11.4	23.9	26.0	460	600

Calico Metal Alloys LLP exports their products to countries like UAE, Bahrain, Italy, Indonesia, Malaysia, United States, Mexico, Chine, Brazil, Peru, Nigeria, Kuwait, Jordan, Dubai, Thailand (Bangkok), Venezuela, Iran, Germany, UK, Canada, Russia, Turkey, Australia, New Zealand, Sri Lanka, Vietnam, South Africa, Kazakhstan & Saudi Arabia.

Stainless Steel & Special Alloys Materials

Stainles Steel 304/304H