1. Basic Information

Standard: ASTM A193/A193M (alloy steel studs for high temp & high pressure)Material: Cr-Mo alloy steelType: Double-ended stud, fully threaded studThread: UNC, 8UN, Grade 2ASize: Imperial 1/4"～4", Metric M6～M100

2. Chemical Composition (%)

C: 0.38–0.48 | Mn: 0.75–1.00 | P: ≤0.035 | S: ≤0.040Si: 0.15–0.35 | Cr: 0.80–1.15 | Mo: 0.15–0.25

3. Core Mechanical Properties

Min tensile strength: 100 KSI (689 MPa)Min yield strength: 80 KSI (551 MPa)Elongation: ≥18%Hardness: HB 197–235 (HRB 92–99), max HB 235 strictly controlledHeat treatment: Quenched and tempered

4. Key Characteristics (vs B7)

Good sulfide stress corrosion cracking (SSC) resistance, suitable for acidic environmentsStrict hardness upper limit, better toughness than B7Working temp range: -29℃～538℃ (-20°F～1000°F)Inspection: 100% individual hardness test, batch impact toughness verification

5. Surface Treatment

Common types: Blackening, phosphating, PTFE coating, hot-dip galvanizing, cadmium plating

1. Basic Information

Complies with ASTM A194/A194M and ASME B18.2.2 standardsMaterial: Medium carbon steel, finished by quenching and temperingType: Heavy duty hex nut, with wider flat width than regular hex nutsThread: UNC 2B (≤1"), UNC/8UN 2B (>1")Size range: Imperial 1/4"～4", Metric M6～M100

2. Chemical Composition (%)

C: ≥0.15 Mn: ≤1.00 P: ≤0.04 S: ≤0.05 Si: ≤0.40

3. Mechanical Properties

Proof load: 150 ksi (1034 MPa)Hardness: HB 159–237Quenched and tempered heat treatment, ensures strength matches B7M studs

4. Key Characteristics (vs 2H grade)

With sulfide stress corrosion cracking resistance, stricter hardness controlSuitable for acidic working conditions, dedicated matching nut for A193 B7M studs

B7M + 2HM Combo Core Points

Standard pairing: A193 B7M studs must match A194 2HM nuts, 2H nuts are not replaceable.Application scope: Acidic oil and gas fields, refinery units, H₂S-containing pressure vessel and flange connections.Strength matching: Stud tensile strength 100 ksi, nut proof load 150 ksi, fits high temp, high pressure and corrosion working demands.Installation specs: Must use ASTM F436 hardened washers; tighten to rated torque, prevent over-tightening and stress concentration.

Common Application Scenarios

Oil and gas extraction: Wellhead equipment, christmas trees, pipeline flanges.Refining and chemical industry: Hydrogenation units, acidic water systems, high temp and high pressure reactors.Power industry: Boiler, turbine and heat exchanger connections.Other fields: Pressure vessels, valves and pump units with sulfur-containing media.

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