ASTM A320 Grade L7 Bolt, Nuts, Washers Manufacturer in India

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ASTM A320 Grade L7, ASTM A320 Grade L7 Bolt, Nuts, ASTM A240 Bolt Manufacturer in India – China Inconel Bolts Inc.

ASTM A320 Grade L7 is a high-strength 5 percent chromium ferritic steel used to manufacture bolts, studs, stud bolts, and other fasteners for bolting pressure vessels, valves, flanges, and fittings, particularly in the power generation industry. The ASTM A240 standard includes alloy and stainless steel bolting for pressure vessels, valves, flanges, and fittings used in high temperature or high-pressure applications, as well as other special applications. There are many grades covered, including ferritic steels and austenitic stainless steels with designations such as B5, B6, B7, B8, B8M, and so on.

ASTM A320 Grade L7 Chemical Composition

Elements	Content, %	Allowable Variation, Over or Under, %
Carbon	0.08 max	0.01 over
Manganese	2.00 max	0.04
Phosphorus	0.04 max	0.005 over
Sulfur	0.03 max	0.005 over
Silicon	1.00 max	0.05
Nickel	24.00 – 27.00	0.20
Chromium	13.50 – 16.00	0.20
Molybdenum	1.00 – 1.50	0.05
Titanium	1.90 – 2.35	0.05
Aluminium	0.35 max	0.05 over
Vanadium	0.10 – 0.50	0.03
Boron	0.001 – 0.010	0.0004 under to 0.001 over

ASTM A320 Grade L7 Mechanical Composition

Tensile Class	Tensile Strength, min		Yield strength, 0.2% offset, min		Elongation in 4D min, %	Reduction of Area, min, %
Tensile Class	KSI	MPa	KSI	MPa	Elongation in 4D min, %	Reduction of Area, min, %
A, B and C	130	895	85	585	15	18
D	130	895	105	725	15	18