ASTM A193 Grade B8 Class 2 Bolts
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ASTM A193 Grade B8 is a standard material specification for corrosion resistant austenitic stainless steel fasteners, for use in high tensile, high temperature and special purpose applications such as pressure piping, pressure vessels bolting. Grade B8 is a heat-treated, work-hardened (or both) austenitic stainless steel further divided into class 1, class 2, class 2B, each having a distinguished tensile strength. ASTM A193 specification covers requirements for chemical composition, mechanical properties, hardness, heat-treatment and recommended nuts-washers for Grade B8 Fasteners.
ASTM A193 Grade B8 Class 2 Bolts jolts and strung studs are produced from AISI 304 hardened steel. Type 304 is the most widely recognized review of treated steel utilized in the latch business. Latches produced utilizing this austenitic tempered steel require carbide arrangement treatment on bars to be strung or after the heading activity for jolts with fashioned heads. Carbide arrangement treatment, additionally alluded to as arrangement toughening, is a procedure in which clasp or pure bars are warmed and afterward water-extinguished to guarantee most extreme consumption obstruction.
A193 Grade B8 Class 2 jolts are strain solidified after carbide arrangement treatment to accomplish expanded quality attributes and lessen the potential for irking. Class 2 jolts are stamped "B8SH" with the review image underlined.
ASTM A193 Grade B8 Class 2 Bolts is a standard material determination for consumption safe austenitic hardened steel clasp, for use in high ductile, high temperature and unique reason applications, for example, weight funneling & weight vessels catapulting. Review B8 Class 2 is a carbide-arrangement treated & strain-solidified 304 hardened steel with least malleable prerequisite of 125 ksi, yield 100 ksi and most extreme hardness of 35 HRC. This particular spreads prerequisites for compound structure, mechanical properties, hardness, warm treatment and prescribed nuts-washers for Grade B8 Class 2 Fasteners.
ASTM A193 B8 CL2 Bolts Specification
| ASTM A193 B8 CL2 Bolt Type | ASTM A193 B8 CL2 Anchor Bolt, Carriage Bolt, Flange Bolt, 12 Point Bolt, Hex and Hex Flange Bolts, Hex Head Cap Screw, Place Bolt, Socket Head Cap Screws, Hanger Bolt, Hexagon Bolt / Tap Bolt, Lag Bolt, Machine Bolt, Plow Bolt, Shoulder Bolt, Square Head Bolt, Stud Bolt, T-Head Bolt, Toggle Bolt, U-Bolt |
|---|---|
| Inch | #0000 -3" (customized sizes available) |
| Metric | M1.6 - M48 |
| Length | Customized Length |
| Grade | Non Ferrous, 12.9, 10.9, 9.8, 8.8, 5.8, 4.6, B8, 2, 5, 8, L9 |
| Material | Brass, Bronze / Copper Base Alloy, Copper, Molybdenum, Steel, Hardened Steel, Stainless Steel, Superalloy (Inconel, 718 Bolts, Hastelloy, Monel), Titanium, Exotic Metals, Other |
| Method | Cold forming, Hot Forging, Wire Forming |
| Fastener Standards | ASME / ANSI, BS, DIN, ISO, JIS, SAE, Other |
| Application Industries & uses | Agriculture, Automotive, Construction and Infrastructure, Energy, Transportation |
| Testing Methods | ASTM E38, E76 and E354, ASTM E53, E54, E62, E75and E478, ASTM E34, E101 and E227, ASTM E 120 and E1409. |
| Threads Configuration | ASME B1.1 2A/3A – 2B/3B Inch Unified Threads and B1.13M 6h-6G Metric Coarse Threads |
| Thread Diameters | M6 to M36 |
| Certification | Dual Certified As per ASTM & ASME Codes |
ASTM Standards Of ASTM A193 B8 CL2 Bolts
| ASTM A193 B7 | Alloy steel, AISI 4140/4142 quenched and tempered |
| ASTM A193 B8 | Class 1 Stainless steel, AISI 304, carbide solution treated. |
| ASTM A193 B8 CL2 | Class 1 Stainless steel, AISI 316, carbide solution treated. |
| ASTM A193 B8 | Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened |
| ASTM A193 B8 CL2 | Class 2 Stainless steel, AISI 316, carbide solution treated, strain hardened |
ASTM A193 B8 CL2 Bolts Characteristics
| Grade | Description | Diameter | Tensile Strength, min. | Yield Strength, min. | Hardness, max. | Marking |
| ASTM A193 B7 | Chromium-Molybdenum | 2 1/2” and under | 125 | 105 | 321 HB or 35 HRC | B8 |
| over 2 1/2” to 4” | 115 | 95 | 321 HB or 35 HRC | |||
| over 4” to 7” | 100 | 75 | 321 HB or 35 HRC | |||
| ASTM A193 B8 CL2 class 1 | S30400 (304) | all | 75 | 30 | 223 HB or 96 HRB | B8 |
| ASTM A193 B8 CL2 B8 CL2 class 2 | S30400 (304) | 3/4” and under | 125 | 100 | 321 HB or 35 HRC | B8SH |
| over 3/4” to 1” | 115 | 80 | 321 HB or 35 HRC | |||
| over 1” to 1 1/4” | 105 | 65 | 321 HB or 35 HRC | |||
| over 1 1/4” to 1 1/2” | 100 | 50 | 321 HB or 35 HRC | |||
| ASTM A193 B8 CL2 class 1 | S31600 (316) | all | 75 | 30 | 223 HB or 96 HRB | B8 CL2 |
| ASTM A193 B8 CL2 class 2 | S31600 (316) | 3/4” and under | 110 | 95 | 321 HB or 35 HRC | B8 CL2SH |
| over 3/4” to 1” | 100 | 80 | 321 HB or 35 HRC | |||
| over 1” to 1 1/4” | 95 | 65 | 321 HB or 35 HRC | |||
| over 1 1/4” to 1 1/2” | 90 | 50 | 321 HB or 35 HRC |
Available ASTM A193 B8 CL2 Bolts Other Types
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Chemical Composition
| Carbon | Manganese, max | Phosphorus, max | Sulfur, max | Silicon | Chromium |
|---|---|---|---|---|---|
| 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0-20.0 |
Raw Material Description
| Grade | Tensile Class | Raw Material Description |
|---|---|---|
| B8 | Class 2 | AISI 304 Stainless Steel, Carbide Solution Treated and Strain Hardened |
Mechanical Properties
| Grade | Diameter | Tensile Strength | Yield Strength | Elongation | Reduction | Hardness |
|---|---|---|---|---|---|---|
| Grade B8, B8M, Class 1, 1D | All Diameters | 515 | 205 | 30 | 50 | 223 HBW or 96 HRB |
| Grade B8, B8C, B8T, Class 2 | M20 and under | 860 | 690 | 12 | 35 | 321 HBW or 35 HRC |
| Grade B8, B8C, B8T, Class 2 | M20 to M24, inclusive | 690 | 550 | 20 | 45 | 321 HBW or 35 HRC |
| Grade B8, B8C, B8T, Class 2 | M24 to M30, inclusive | 655 | 450 | 25 | 45 | 321 HBW or 35 HRC |
| Grade B8, B8C, B8T, Class 2 | M30 to M36, inclusive | 620 | 345 | 30 | 45 | 321 HBW or 35 HRC |
| Grade B8, B8M2, Class 2B | M48 and under | 655 | 515 | 25 | 40 | 321 HBW or 35 HRC |
| Grade B8, B8M2, Class 2B | M48 to M64, inclusive | 620 | 450 | 30 | 40 | 321 HBW or 35 HRC |
| Grade B8, B8M2, Class 2B | M64 to M72, inclusive | 550 | 380 | 30 | 40 | 321 HBW or 35 HRC |
ASTM A193 B8 CL2 Bolts Industrial Applications
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