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లక్షణాలు
A320 B8M stud bolt
Oxid black, Hot dip galvanized, Cad-plated, Blue PTFE Coated(Blue XYLANE 1014,1424),Teflon
ప్రామాణిక | DIN | ANSI/ASME | GB | JIS | NON-STANDARD |
పరిమాణం | Dia. M5-M100,1/4 above | ||||
మెటీరియల్ | Material Stainless steel, Duplex Steel | ||||
గ్రేడ్ | A2-70,A4-70,A4-80,B8,B8M, B8 Cl2, B8M Cl2 | ||||
ముగించు | Plain, Y.Z.P., Black, Z.P.HDG plated,PTFE,CAD PLATED | ||||
సర్టిఫికెట్ | ISO9001:2008 , TS16949 | ||||
పేరు | A193/A320 B8,B8M |
ASTM A193
Scope
Originally approved in 1936, this specification is heavily utilized in petroleum and chemical construction applications. The ASTM standard covers alloy steel and stainless steel bolting materials for high temperature or high pressure service. This specification includes fasteners intended for use in pressure vessels, valves, flanges, and fittings. Although, this material is often available in national coarse (UNC) thread pitches, if being used in traditional applications, threads are specified 8 threads per inch (tpi) for diameters above one inch.
Below is a basic summary of a few of the common grades. ASTM A193 covers a number of other standard specifications not covered in this description including B5, B6, and B16.
Recommended coating,
Oxid black, Hot dip galvanized, Zinc plated, Cad-plated, Blue TPFE Coated(Blue XYLANE 1014,1424), Green TPFE Coated(Green XYLANE 1014,1424).FEFLON coated
Grades
B7 | Alloy steel, AISI 4140/4142 quenched and tempered |
B8 | Class 1 Stainless steel, AISI 304, carbide solution treated. |
B8M | Class 1 Stainless steel, AISI 316, carbide solution treated. |
B8 | Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened |
B8M | Class 2 Stainless steel, AISI 316, carbide solution treated, strain hardened |
యాంత్రిక లక్షణాలు
గ్రేడ్ | పరిమాణం | Tensile ksi, min | Yield, ksi, min | Elong, %, min | RA % min |
B7 | Up to 2-1/2 | 125 | 105 | 16 | 50 |
2-5/8 - 4 | 115 | 95 | 16 | 50 | |
4-1/8 - 7 | 100 | 75 | 18 | 50 | |
B8 Class 1 | All | 75 | 30 | 30 | 50 |
B8M Class 1 | All | 75 | 30 | 30 | 50 |
B8 Class 2 | Up to 3/4 | 125 | 100 | 12 | 35 |
7/8 - 1 | 115 | 80 | 15 | 35 | |
1-1/8 - 1-1/4 | 105 | 65 | 20 | 35 | |
1-3/8 - 1-1/2 | 100 | 50 | 28 | 45 | |
B8M Class 2 | Up to 3/4 | 110 | 95 | 15 | 45 |
7/8 - 1 | 100 | 80 | 20 | 45 | |
1-1/8 - 1-1/4 | 95 | 65 | 25 | 45 | |
1-3/8 - 1-1/2 | 90 | 50 | 30 | 45 |
Chemical Properties
మూలకం | B7 (AISI 4140) | B8 (AISI 304) | B8M (AISI 316) |
Carbon | 0.37 - 0.49% | 0.08% max | 0.08% max |
Manganese | 0.65 - 1.10% | 2.00% max | 2.00% max |
Phosphorus, max | 0.035% | 0.045% | 0.045% |
Sulfur, max | 0.040% | 0.030% | 0.030% |
Silicon | 0.15 - 0.35% | 1.00% max | 1.00% max |
Chromium | 0.75 - 1.20% | 18.0 - 20.0% | 16.0 - 18.0% |
నికెల్ | 8.0 - 11.0% | 10.0 - 14.0% | |
Molybdenum | 0.15 - 0.25% | 2.00 - 3.00% |
Recommended Nuts and Washers
Bolt Grade | నట్స్ | దుస్తులను ఉతికే యంత్రాలు |
B7 | A194 Grade 2H | F436 |
B8 Class 1 | A194 Grade 8 | SS304 |
B8M Class 1 | A194 Grade 8M | SS316 |
B8 Class 2 | A194 Grade 8 | SS304 |
B8M Class 2 | A194 Grade 8M | SS316 |