ASTM A105 Blind Flange

ASME A105 Blind Flange - High-Pressure Forged Carbon Steel Solution

Product Overview

The ASME A105 Blind flange is a precision-forged carbon steel component designed to permanently or temporarily seal piping system ends, pressure vessel openings, and valve connections. Manufactured from premium ASTM A105 carbon steel using advanced forging technology, these blind flanges deliver superior mechanical properties through optimized grain structure alignment. With 42 years of manufacturing expertise, JS FITTING's facility produces these flanges with strict adherence to ASME B16.5 standards, featuring pressure ratings from Class 150 to Class 2500. Our annual production capacity of 30,000 tons ensures reliable supply for your industrial projects requiring high-integrity sealing solutions.

Key Features & Advantages

Forged Construction Benefits

· Enhanced grain flow structure provides 25% higher tensile strength than cast alternatives

· Superior impact resistance for high-pressure cycling applications

· Uniform wall thickness throughout the flange body

· 100% Forged Construction: Unlike cheaper plate-cut alternatives, our blind flanges are hot-forged to ensure maximum structural integrity and compliance with ASME B16.5 safety factors.

Multiple Pressure Class Options

· Available in Class 150, 300, 600, 900, 1500, and 2500 ratings

· Temperature range: -29°C to 450°C (-20°F to 842°F)

· Hydrostatic test pressure compliance per ASME B16.5

Versatile Face Type Configurations

· Raised Face (RF) for standard industrial applications

· Flat Face (FF) for low-pressure systems

· Ring Type Joint (RTJ) for critical high-pressure services

Technical Specifications

 Standards & Certifications

Our manufacturing processes comply with internationally recognized standards:

· ASME B16.5: Primary dimensional and pressure rating standard

· ASTM A105/A105M: Material specification for carbon steel forgings

· ASME B16.47: Large diameter flange applications

· API 605: Large diameter carbon steel flanges

· MSS SP-44: Steel pipeline flanges

Quality certifications include ISO 9001, CE marking, and GOST-R compliance for global market acceptance.

Chemical Composition & Mechanical Properties

Chemical Composition (ASTM A105)

· Carbon: 0.35% max

· Manganese: 0.60-1.35%

· Phosphorus: 0.035% max

· Sulfur: 0.040% max

· Silicon: 0.15-0.40%

· Copper: 0.40% max

Mechanical Properties

· Tensile Strength: 485 MPa (70,000 psi) minimum

· Yield Strength: 250 MPa (36,000 psi) minimum

· Elongation: 22% minimum in 2 inches

· Hardness: 187 HBW maximum

Manufacturing Process

Our advanced production facility employs precision forging techniques:

1. Material Selection: Virgin ASTM A105 steel billets undergo chemical analysis

2. Hot Forging: Controlled heating to 1200°C for optimal grain structure

3. Precision Machining: CNC machining ensures dimensional accuracy ±0.8mm

4. Heat Treatment: Normalizing process for enhanced mechanical properties

5. Quality Testing: Dimensional inspection, hardness testing, and PMI verification

Surface Finish & Coating Options

Standard Finishes

· Sandblasting to Sa2.5 grade for optimal coating adhesion

· Anti-rust oil application for short-term storage

· Machine finish on sealing surfaces (125-250 microinch Ra)

Protective Coating Options

· Water-based eco-friendly paint (150 microns thickness)

· Epoxy coating for enhanced corrosion resistance

· Hot-dip galvanizing for marine environments

· Custom coating specifications available

Applications

Oil & Gas Industry

These flanges serve as reliable isolation points in pipeline systems and refinery operations. The ASME A105 Blind Flange enables safe maintenance access while containing hydrocarbon pressures up to the rated capacity.

Power Generation

Steam header terminations and feedwater line isolation applications benefit from the high-temperature capabilities and pressure containment of these forged components.

Chemical Processing

Pressure vessel inspection ports and piping system isolation points utilize these flanges for both permanent and temporary sealing requirements in non-corrosive to mildly corrosive environments.

Packaging & Delivery

Protective Packaging

· Individual plastic wrapping for smaller sizes

· Wooden crates for bulk shipments

· Custom packaging for special requirements

Global Logistics Network

Our dedicated shipping partnerships ensure timely delivery worldwide. Standard lead times range from 15-30 days depending on specifications and quantity requirements.

Customization Service

We accommodate specific project requirements including:

· Non-standard dimensions and pressure ratings

· Special material heat treatment (A105N normalized condition)

· Custom bolt hole patterns

· Project-specific marking and documentation

· Third-party inspection services

Quality Control

Comprehensive Testing Protocol

· Chemical composition analysis using spectrometer

· Dimensional verification with CMM equipment

· Hardness testing per ASTM E18

· Positive Material Identification (PMI)

· Hydrostatic pressure testing when specified

Documentation Package

Each shipment includes material test certificates, dimensional reports, and compliance documentation meeting your project specifications.

Certificates

Our commitment to quality is validated by numerous international certifications:

• ISO 9001:2015 Quality Management System
• CE/PED (Pressure Equipment Directive) Certification
• API 6A License for Wellhead Equipment
• GOST-R Certification for Russian Market
• Customer-specific certifications available

Customer Reviews

"We tested the flanges, their performance is very nice. We will make the new purchase plan for the warehouse." - Industrial Distributor

"The flanges are exactly in line with our requirement technically and competitive commercially." - Petrochemical Contractor

"I am thoroughly impressed with the quality of the fittings provided by JS FITTINGS. Each piece we've received has been meticulously crafted, displaying excellent workmanship that is truly top-notch." - Pipeline Constructor

FAQ

Q: How do you prevent rust during long-term sea freight?
A: Every JS FITTINGS blind flange is treated with a high-grade anti-rust oil or industrial lacquer. For marine environments, we recommend our Hot-Dip Galvanized or Yellow Zinc Plated options which provide up to 10 years of corrosion resistance.

Q: Can you provide 24" and larger blind flanges?
A: Yes, we manufacture large-diameter blind flanges up to 48" according to ASME B16.47 Series A or B (MSS SP-44 / API 605).

Q: What is the difference between ASTM A105 and A105N Blind Flanges?

A105N requires normalizing heat treatment to improve notch toughness and low-temperature performance, while standard A105 can be supplied as-forged.

Q: Can these flanges be used in corrosive environments?

ASTM A105 carbon steel requires protective coating for corrosive applications. Consider stainless steel alternatives for highly corrosive environments.

Q: What is the maximum pressure rating available?

Pressure capacity depends on Class rating and operating temperature per ASME B16.5. Class 2500 provides the highest pressure capability.

Q: Why is face type selection important?

Face type determines sealing integrity. RTJ faces are essential for high-pressure applications (Class 600+), while RF faces suit standard industrial use.

Q: Is ASTM A105 suitable for low-temperature service?

ASTM A105 is limited to -29°C (-20°F) minimum. For cryogenic applications, specify ASTM A350 LF2 material instead.

Contact Us

Get your ASME A105 Blind Flange quote today. Email aadmin@jsfittings.com for technical specifications and pricing.