Grade B7/B7M ASTM A194 Grade 2H-20ºF (-30ºC) to +1000ºF (+538ºC) testing is required for 5/8 size and over as per ASTM A194 supplementary section S3 if the valve is used in service lower than -29ºC. ASTM Valve Bolting Specifications Temperature materials B7 L7 B8M L7M A193 Gr B16 A320 Bolt Depot - Selecting Fastener Materials - Steel Grades Grade 5 bolts are hardened to increase strength and are the most common bolts found in automotive applications. Grade 5 bolts have 3 evenly spaced radial lines on the head. Grade F is roughly equivalent to Grade 5. Grade F nuts are used with Grade 5 bolts. Grade 8 / Grade G. Grade 8 bolts have been hardened more than grade 5 bolts.
USA Grade 8 bolts are alloy and are stronger than grade 5 bolts. They are used in demanding applications. USA Grade 8 bolts have six evenly spaced radial lines on the head, and the material is similar in strength to European metric class 10.9. Products . Inch American Nuts Grades. Grade A grade 2 Grade B grade 5 Grade C grade 8 . Commercial Fasteners Bolt Grades, Strength & MaterialsFinish is equivalent in strength to Grade 8 but without the yellow color. Grade 5. Grade 5 alloy steel is a medium carbon zinc plated alloy steel that is heat treated to increase hardness. Grade 5 bolts have three (3) evenly spaced hash marks on the head markings (manufacturers mark may also be included). Grade 8 / Grade G HIGH TENSILE :METRI VS. IMPERIAL LASS VS. GRADE Grade 8 Medium Carbon Alloy quenched and tempered 1/4 through 1-1/2 120,000 130,000 150,000 Metric Bolts Head Marking Class and Material Nominal Size Range Mechanical Properties Proof Load (MPa) Min. Yield Strength Min. Tensile Strength (MPa) 8.8 Class 8.8 Medium Carbon Steel, quenched and tempered All sizes below M16 580 640 800 M16 - M72 600
Sep 26, 2011 · In actual fact, Grade 5 bolts are often preferred over Grade 8 . A Grade 8 has a very high tensile strength, but can be brittle. In applications such as suspensions, a very high number of load/unload cycles can produce work hardening, which produces an immediate, or catastrophic failure. MATERIAL COMPARISON TABLE - rolfincKS/JIS Symbol KS/JIS Number Remark DIN Type DIN Material Remark Number Number A36 K02600 SMS400A/SM400A D3515/G3106 (23) St44-2 17100 1.0044 <1.1/2in Structural Steel St44-2 17100 1.0044 Thick. (25) A48 Gray Cast Iron Casings Grade B7 G41400 SNB7/SNB7 D3755/G4107 (3a) 42CrMo 4 17200 1.7225 (3c) MATERIAL GRADE COMPARISON TABLEMATERIAL GRADE COMPARISON TABLE Material No. USA JAPAN GB BS 0.9620 G-X260NiCr42 Grade 2A Ni-Hard 2 0.9625 G-X330NiCr42 Grade 2B Ni-Hard 1 0.9630 G-X300CrNiSi952 Ni-Hard 4 0.9635 G-X300CrMo153 0.9640 G-X300CrMoNi1521 0.9645 G-X260CrMoNi2021 0.9650 G-X260Cr27 Grade 3D A532IIIA25%Cr 0.9655 G-X300CrMo271 0.9655 G-X300CrMo271 Grade 3E
The B7 grade bolts are a heat treated chromium-molybdenum steel. This grade of bolt is commonly used for fastening of medium high temperature service materials. They have a liquid quench range of 50 to 900 degrees Fahrenheit and an air quench range of -40 to 900 degrees Fahrenheit. What is B7 alloy? - Practical MachinistJul 29, 2005 · B7 is a grade of the spec, A-193, Alloy Steel and Stainless Bolting Materials for High Temp Services. B-7 is a chrome moly steel with a min tensile y. Fasteners With Similar StrengthsISO 898-1 Class 4.6, ASTM A307 Grade A and B, ASTM F1554 Grade 36, and SAE J429 Grade 2. ISO 898-1 Class 8.8, SAE J429 Grade 5, ASTM A193 Grade B7, ASTM A320 Grade L7, ASTM A449, and ASTM A354 Grade BC. ISO 898-1 Class 10.9, SAE J429 Grade 8, and ASTM A354 Grade BD. ISO 898-1 Class 12.9, Grade 9, and ASTM A574. 3. Tables
Jun 17, 2020 · With a minimum tensile strength of 150 ksi and a minimum yield of 130 ksi, Grade 8 has a higher tensile and yield strength than other steel grades such as Grade 5 and B7. It is also quenched and tempered at 800 F leading to its strength. Grade 8 has 0.28-0.55% carbon, 0.030% max phosphorus, and 0.050% max sulfur.