The austenitic structure also gives these grades excellent toughness, even down to cryogenic temperatures. B7 threaded studs and short, headed bolts are readily available in the marketplace. We can also produce flats and squares not covered by the standard, on request, to reduce machining costs up to Grade L is more resistant to carbide precipitation and can be used in the above temperature range. Grade B16 bolts and studs are used in the power and petrochemical industries on boilers, turbines, and other pressurized equipment with elevated temperatures. Note that coated bolts may not be able to withstand the high temperatures that uncoated B7 bolts can be subjected to. Background Grade is the standard molybdenum-bearing grade. Grade B8M Class 1 fasteners require carbide solution treatment, while Class 2 fasteners require an additional strain hardening operation which increases the strength and reduces the susceptibility to galling. This website summarizes the similarities and differences between many of the grades. Carbide solution treatment, also referred to as solution annealing, is a process in which fasteners or stainless bars are heated and then water-quenched to assure maximum corrosion resistance.
This specification covers ASTM-A Mechanical Properties for inch and metric size alloy and stainless steel bolting material for pressure vessels, valves. ASTM A MECHANICAL / CHEMICAL REQUIREMENTS and other fasteners under the L7 grade have the same chemical and physical properties as B7.
ASTMA Mechanical Properties
The ASTM standard covers alloy steel and stainless steel bolting materials for high temperature or high A Mechanical Properties.
If you need more information about these variations, contact me. NOTE: the standard allows that, for diameters over 1. See table below for B8M Class 2 material chemical composition standard chemical compositions for a range of stainless steels is also given for information.
Video: Astm a193 mechanical properties Mechanical Properties Definitions {Texas A&M: Intro to Materials}
Grade B8M Class 1 fasteners require carbide solution treatment, while Class 2 fasteners require an additional strain hardening operation which increases the strength and reduces the susceptibility to galling. There are several grades within the A specification.
ASTM A Portland Bolt
Note that coated bolts may not be able to withstand the high temperatures that uncoated B7 bolts can be subjected to.
Grade B7 is the most common grade of A bolts used in construction.
ASTM A Specification Boltport Fasteners
ASTM A B8R Stainless steel, AISI. ASTM A specification for alloy-steel and stainless steel fasteners for high mechanical properties, heat-treatment, recommended nuts-washers and bolt.
Chemical Composition See table below for B8M Class 2 material chemical composition standard chemical compositions for a range of stainless steels is also given for information.
Fasteners manufactured using this austenitic stainless steel require carbide solution treatment on bars to be threaded or after the heading operation for bolts with forged heads. Type is the most common grade of stainless steel used in the fastener industry. Grade B8M Class 1 fasteners require carbide solution treatment, while Class 2 fasteners require an additional strain hardening operation which increases the strength and reduces the susceptibility to galling.
Video: Astm a193 mechanical properties Mechanical Properties of Engineering Materials - Design of Machine
There are several grades within the A specification. We can also produce flats and squares not covered by the standard, on request, to reduce machining costs up to
Grade B8M Class 1 fasteners require carbide solution treatment, while Class 2 fasteners require an additional strain hardening operation which increases the strength and reduces the susceptibility to galling. Because these bolts are manufactured from stainless steel, they are used in highly corrosive environments with elevated ambient temperatures.
We stock round bar from 10 mm to 75 mm diameter, and hexagons from 10 mm to 60 mm AF.
Fasteners manufactured using this austenitic stainless steel require carbide solution treatment on bars to be threaded or after the heading operation for bolts with forged heads.