ASTM A193 B7 / A194 2H Flange Bolt Kit (RF Flanges)

Description

1. Product Overview

ASTM A193 B7 / A194 2H Flange Bolt Kit (RF Flanges) is a matched fastener set engineered for high-pressure, high-temperature flanged connections in industrial piping and pressure-vessel systems. The kit includes ASTM A193 Grade B7 bolts and ASTM A194 Grade 2H nuts, manufactured and heat-treated to deliver predictable tensile strength, toughness, and thread integrity for raised-face (RF) flange assemblies. Its primary value proposition is reliable joint integrity under cyclic load, thermal stress, and corrosive service when combined with correct gasket selection and bolting practice. Strategically, this kit minimizes unplanned shutdowns and maintenance costs by providing specification-compliant, traceable fasteners for critical oil & gas, petrochemical, power generation, and heavy industrial projects.

2. Key Specifications & Technical Characteristics

• Material: Bolts — ASTM A193 Grade B7 (alloy steel, quenched and tempered); Nuts — ASTM A194 Grade 2H (carbon steel, heat treated).

• Chemical composition (typical): Bolt (B7): C 0.37–0.44%; Mn 0.6–1.1%; Cr 0.9–1.35%; Mo 0.15–0.25%; remainder Fe; Nut (2H): per ASTM A194 chemical limits for carbon/low-alloy steel.

• Mechanical properties: Bolt tensile strength ≥ 125 ksi (862 MPa) typical; yield strength and hardness per ASTM A193/A194 specifications.

• Thread standard: Unified/metric threads per customer spec (e.g., ASME B1.1 or ISO), rolled threads standard; matched nut seating.

• Finish options: Plain/black oxide, hot-dip galvanised, zinc plated, PTFE/anti-seize coating, or custom coatings for corrosion resistance.

• Physical characteristics: Form — hex head bolts and hex nuts; sizes — available in common diameters and lengths for RF flange bolt circles; head marking per ASTM for traceability.

• Tolerances: Dimensional tolerances per ASME/ANSI standards and customer drawings.

• Packaging options: Wooden crates, steel drums, palletized shrink-wrap, or bulk bagging with corrosion inhibitor and desiccant; individual kits banded and labeled with part number, material cert, and batch trace.

• Documentation: Mill test certificates (MTC / 3.1), material traceability, heat-treatment records, dimensional inspection reports.

• Shelf life: Indefinite when stored dry; recommended indoor storage to prevent corrosion.

• Quality certifications: Manufactured under ISO 9001 quality system; testing per ASTM/ASME requirements.

3. Core Industrial Applications

• Primary industries: Oil & gas (upstream, midstream, downstream), petrochemical and chemical processing, power generation (steam, nuclear, thermal), LNG, marine and offshore platforms, heavy industry and refineries.

• Specific operational use cases: Bolting RF flanges on high-pressure pipeline spools, pressure vessel manways and nozzles, heat exchanger connections, steam systems operating at elevated temperatures, and critical repair/turnaround bolt kits.

• Performance advantages vs alternatives: Alloy-steel B7/2H combination offers a superior balance of tensile strength, ductility and elevated-temperature performance compared with standard Grade 8 or stainless alternatives in applications where corrosion and galling are managed separately. This kit reduces joint relaxation under thermal cycling and resists embrittlement compared with lower-grade fasteners.

• Commercial relevance: Standardized kit format simplifies procurement and on-site installation during planned shutdowns, reduces assembly errors, and ensures compatibility with flange specifications to accelerate commissioning and reduce leak risks.

4. Competitive Advantages

• Quality consistency: Manufactured and heat-treated to ASTM standards with full MTCs and batch traceability to ensure reproducible mechanical properties across deliveries.

• Supply reliability: Production planning and safety-stock policies support repeatable lead times for large-scale projects and staggered deliveries for construction phases.

• Logistics capability: Flexible packaging and containerized shipments, consolidated kitting for turnarounds, and export-ready documentation streamline customs and site logistics.

• Price competitiveness: Economies of scale for bulk 20 MT orders, option for multi-year contracts to lock favorable pricing and capacity.

• Sustainability: Options for reduced-packaging kits, recyclable pallet/crate materials, and supplier adherence to environmental management systems.

• Technical support: Availability of engineering support for bolt sizing, torque/tension calculations, and recommended lubrication/installation procedures; downloadable datasheets and test certificates on request.

5. Commercial & Supply Information

• Minimum order quantity (MOQ): BULK 20 MT

• Loading capacity: MT per container — typical 20-foot container capacity up to ~20 MT (subject to packaging and cube); 40-foot container capacity up to ~25–27 MT (subject to packaging and cube).