What is the difference between L7 and L7M?

What is the difference between L7 and L7M?

Grade L7 bolts are significantly higher in strength than Grade L7m bolts. A320 Grade L7 fasteners require a permanent marking of “L7” on bolt heads and one end of rods, while Grade L7M fasteners are marked “L7M”. Compatible nuts for both grades that have been impact tested are marked with the letter “L”.

What grade is B7 equivalent to?

Grade 5
ASTM A193 B7 is a chrome-moly steel with strength similar to Grade 5 properties and is commonly used in high temperature and pressure applications.

What is the difference between A193 and A320?

The only difference between the two bolts is intended application. A193 bolts are intended for high temperature and high pressure applications, while A320 bolts are for cold temperature applications.

Is B7 carbon steel?

Grade B7 is a heat-treated chromium-molybdenum low-alloy steel with minimum tensile strength requirement of 125 ksi (860 Mpa), yield 105 ksi (720 Mpa), and maximum hardness of 35HRC. A193 Grade B7 is the most commonly used Bolt specification coupled with A194 Grade 2H Nuts for Bolting Carbon Steel pipeline.

What is B7 equivalent to?

ASTM A193 B7 is a chrome-moly steel with strength similar to Grade 5 properties and is commonly used in high temperature and pressure applications.

How strong is B7 alloy steel?

Grade B7 is a heat-treated chromium-molybdenum low-alloy steel with minimum tensile strength requirement of 125 ksi (860 Mpa), yield 105 ksi (720 Mpa), and maximum hardness of 35HRC. Boltport uses Alloy Steel AISI 4140 bar stock or forging stock to produce B7 headed and non-headed bolts.

Is L7 a carbon steel?

It is typically used for the manufacture of Bolts, Fasteners, Studs and Studbolts in the Petrochemical industry….Chemical Composition B7/L7.

Element B7 (AISI 4140) L7 (AISI 4140)
Carbon 0.37 – 0.49% 0.37 – 0.49%
Manganese 0.65 – 1.10% 0.65 – 1.10%
Phosphorus, max 0.035% 0.035%
Sulfur, max 0.040% 0.040%

What is L7M?

ASTM A320 Grade L7M is a standard material specification for alloy steel bolting materials for pressure vessels, valves, flanges, and fittings for low temperature services. ASTM A320 Grade L7M is heat treated chromium molybdenum alloy steel (AISI 4140/AISI 4140H) with notch toughness properties.

What is the modulus of elasticity in ASTM A193 GR B7?

ASTM A193 Gr. B7 2. The modulus of elasticity is the typical value used for steels; 30 x 10^6 psi at ambient temperature. The specified minimum mechanical properties are published in the ASTM Specification and are too cumbersome to state here because they are a function of diameter. I would suggest you review this ASTM specification.

What is ASTM A193 grade B7 fastener specification?

ASTM A193 specification covers requirements for chemical composition, mechanical properties, hardness, heat-treatment, recommended nuts-washers for Grade B7 fasteners. ASTM A193 Grade B7 is the most widely fastener specifications, commonly found in bolting or piping, pressure vessels, valves, flanges and fittings.

What are the properties of astastm A193 grade B7?

ASTM A193 Grade B7 Mechanical Properties – Metric Sizes Diameter mm Tensile Strength min, MPa Yield strength, min, 0.2% offset, MPa Elongation in 4D min, % M64 and Under 860 720 16 over M64 to M100 795 655 16 over M100 to M180 690 515 18

What are the mechanical requirements for ASTM A193/a193m?

ASTM-A193 / A193M MECHANICAL REQUIREMENTS Grade and Class Diameter Tensile Strength Min KSI Yield Strength 0.2% Offset KSI Hardness Max Rockwell B5 up to 4″ incl 100 80 – B6 up to 4″ incl 110 85 – B6X up to 4″ incl 90 70 C26 B7 to 2-1/2″ 125 105 C35