JIS Flanges - Guanxin Forging

Japanese JIS Flange Specification

Standard Japanese JIS Flange Dimensions 1/2" (15 NB) to 48" (NB) Size 5K, 10K, 16K, 20K, 30K JIS Flange Standard Cover Dimensions, tolerances, weight, temperature ratings & pressure ratings, marking, materials, testing Flange Face Type

Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)

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Raw Material for Japanese JIS Flange

The raw material for the Japanese JIS flange is generally round steel, which is cut and continuously hammered to eliminate defects such as segregation and porosity in the steel ingot.

Material & Grades of Japanese JIS Flanges

Selecting the appropriate material and grade for Japanese JIS flanges is critical to ensuring that they meet the rigorous demands of various industrial applications. The materials and grades used in the production of Japanese JIS flanges are chosen based on factors such as temperature, pressure, corrosion resistance, and mechanical strength.

Material Type Standard Grades Stainless Steel Japanese JIS Flanges ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L Duplex & Super Duplex Steel Japanese JIS Flanges ASTM / ASME A/SA 182 F 44, F 45, F 51, F 53, F 55, F 60, F 61 Carbon Steel Japanese JIS Flanges ASTM / ASME A/SA 105, ASTM / ASME A 350, ASTM A 181 LF 2 / A516 Gr.70 A36, A694 F42, F46, F52, F60, F65, F70 Low Temperature Carbon Steel Japanese JIS Flanges ASTM A350 LF2, LF3 Alloy Steel Japanese JIS Flanges ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91 Copper Alloy Japanese JIS Flanges ASTM SB 61, SB 62, SB 151, SB 152 UNS No. C (Cu-Ni 90/10), C (Cu-Ni 70/30), UNS No. C, , , , , Nickel Alloy Japanese JIS Flanges ASTM SB 564, SB 160, SB 472, SB 162 Nickel 200 (UNS No. N), Nickel 201 (UNS No. N), Monel 400 (UNS No. N), Monel 500 (UNS No. N), Inconel 800 (UNS No. N), Inconel 825 (UNS No. N), Inconel 600 (UNS No. N), Inconel 625 (UNS No. N), Inconel 601 (UNS No. N), Hastelloy C276 (UNS No. N), Alloy 20 (UNS No. N)

Japanese JIS Flanges Pressure Ratings

Japanese Industrial Standard (JIS) flanges are classified based on specific pressure ratings that denote their ability to withstand different levels of internal pressure. These ratings are integral to the design and application of JIS flanges in various industrial settings.:

• 5K: This rating indicates a flange designed for nominal pressures equivalent to 5 kilograms per square centimeter (kg/cm²), which is approximately 0.49 MPa or 71.5 psi. It is suitable for low-pressure applications.
• 10K: A common rating, JIS 10K flanges can handle pressures up to 10 kg/cm², or about 0.98 MPa or 145 psi. These flanges are used in a wide range of standard industrial applications.
• 10K Light Type: This variant of the 10K rating is designed for specific applications where lighter construction is required, without compromising the pressure handling capacity of the standard 10K flange.
• 16K: Designed for higher pressure systems, JIS 16K flanges are rated for 16 kg/cm², or approximately 1.57 MPa or 229 psi. They are commonly used in petrochemical and high-pressure water systems.
• 20K: With a rating of 20 kg/cm² (1.96 MPa or 285 psi), these flanges are suitable for even more demanding applications requiring greater pressure resistance.
• 30K: For applications with substantial pressure requirements, JIS 30K flanges are rated for 30 kg/cm² (2.94 MPa or 425 psi).
• 40K: These flanges are designed for very high-pressure environments, with a rating of 40 kg/cm² (3.92 MPa or 568 psi).
• 63K: The highest standard in the JIS flange pressure ratings, 63K flanges are built to withstand pressures up to 63 kg/cm² (6.21 MPa or 902 psi), making them suitable for extreme conditions.

Each pressure rating comes with corresponding design specifications, including material thickness, bolt size, and the number of bolts, ensuring that the flange can safely operate under the specified pressure and temperature conditions. It's important to note that the selection of the correct JIS flange depends on the specific application, fluid properties, and safety factors, as outlined in the JIS B and related standards.

Technical Parameters Of Japanese JIS Flanges

Dimensions of JIS B 5K flange standard

PN 5K. Dimensions in mm.

Dimensions of JIS B 10K flange standard

PN 10K. Dimensions in mm.

Dimensions of JIS B 16K flange standard

PN 16K. Dimensions in mm.

Dimensions of JIS B 20K flange standard

PN 20K. Dimensions in mm.

Dimensions of JIS B 30K slip on flange standard

PN 30K, SLIP ON FLANGE. Dimensions in mm.

Dimensions Flat Face and Raised Face of JIS B Flange Facing

Flange Facing. Dimensions in mm.

Dimensions Tongue Face And Groove Face of JIS B Flange Facing

Flange Facing Male & Female Type. Tongue & Groove Type. Dimensions in MM.

Dimensions Tolerance of JIS B Pipe Flange

Flange tolerance. Dimensions in mm.

Japanese JIS Flanges Manufacturing Process

1. Material Selection and Preparation

• Material Selection: Choose high-quality carbon steel, stainless steel, or alloy steel based on application requirements.

• Cutting: Cut pipe billets or steel bars to the required length for forging.

2. Heating

• Preheating: Heat billets to a specific temperature in a controlled environment to make the metal malleable.

3. Forging

• Open Die Forging: Shape the heated billet by hammering or pressing between flat dies.

• Closed Die Forging: Place the billet in a die cavity and forge under high pressure for precise shapes.

• Grain Optimization: Align the grain structure to enhance mechanical properties.

4. Trimming and Flash Removal

• Trimming: Remove excess material (flash) to achieve the correct shape and dimensions.

5. Heat Treatment

• Annealing: Heat and slowly cool flanges to relieve internal stresses.

• Normalizing: Air-cool the flanges after heating above recrystallization temperature.

• Quenching and Tempering: Rapidly cool flanges in water or oil, then reheat for a balance of hardness and toughness.

6. Machining

• Precision Machining: Turn, drill, face, and tap the flanges to achieve exact dimensions and surface finishes.

7. Surface Treatment

• Coating: Apply treatments like galvanizing or painting to enhance corrosion resistance.

8. Inspection and Quality Control

• Dimensional Inspection: Verify that dimensions conform to specifications.

• Non-Destructive Testing: Use ultrasonic, radiographic, and magnetic particle tests to detect defects.

• Hydrostatic Testing: Ensure flanges can withstand internal pressure without leaking.

9. Compliance and Certification

• Standards Compliance: Adhere to international standards like ASME, ASTM, DIN, and ISO.

• Certification: Certify flanges to confirm they meet all specified criteria.

This streamlined process ensures that forged steel flanges are manufactured to the highest standards of quality and reliability.

Manufacturing Standards Referred for Forged Steel Flanges

Ensuring the highest quality and reliability of forged steel flanges involves adhering to several internationally recognized standards. These standards cover various aspects, including material composition, dimensions, pressure ratings, and testing methods. Below are some of the key standards commonly referred to in the manufacturing of forged steel flanges:

1. American Society of Mechanical Engineers (ASME)

• ASME B16.5: Covers pipe flanges and flanged fittings for sizes NPS 1/2 through NPS 24 in classes 150 to . It specifies materials, dimensions, tolerances, marking, and testing.

• ASME B16.47: Standard for large-diameter steel flanges (NPS 26 through NPS 60) in classes 75 to 900. It includes two series of flanges, Series A and Series B, each with different dimensions.

• ASME B16.9: This standard specifies factory-made wrought steel butt-welding fittings.

• ASME Section II (Materials): Provides specifications for materials used in the manufacturing of pressure-retaining parts of boilers and pressure vessels.

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• ASME Section VIII (Pressure Vessels): Covers the rules for the construction of pressure vessels, including the requirements for forged flanges used in pressure vessels.

2. American Society for Testing and Materials (ASTM)

• ASTM A182: Specifies forged or rolled alloy and stainless steel pipe flanges, forged fittings, and valves and parts for high-temperature services.

• ASTM A105: Specifies standards for carbon steel forgings for piping components.

• ASTM A350: Covers several grades of carbon and low-alloy steel forged flanges, fittings, and valves intended primarily for low-temperature service.

• ASTM A694: Specifies carbon and alloy steel forgings for pipe flanges, fittings, valves, and other piping components for high-pressure transmission services.

• ASTM A181: Covers carbon steel forgings for general-purpose piping.

3. Deutsches Institut für Normung (DIN) - German Institute for Standardization

• DIN standards specify the dimensions, materials, and mechanical properties of flanges, fittings, and other piping components. Commonly referenced DIN standards include DIN , DIN , and DIN .

4. International Organization for Standardization (ISO)

• ISO -1: Specifies dimensions and technical delivery conditions for circular flanges.

• ISO : Focuses on material specifications and testing standards for metallic flanges and their connecting elements.

• ISO : Quality management systems standard, ensuring that manufacturing processes and controls are comprehensive and consistent.

5. British Standards (BS)

• BS : Specifies circular flanges for pipes, valves, fittings, and other piping components.

• BS : Aligns with Japanese JIS for pipe flanges, specifying dimensions and pressure ratings for flanges.

6. Petroleum and Natural Gas Industries Standards (API)

• API 6A: Covers flanges and other pressure-containing components used in the oil and gas industries, especially for wellhead and tree equipment.

• API 605: Provides specifications for large diameter carbon steel flanges.

Applications of Japanese JIS Flanges

Forged flanges are renowned for their exceptional performance and are designed to meet rigorous demands across various industries. Our extensive range of forged flanges is available through a global network of stock-keeping branches.

• Oil and Gas: Stainless steel forged flanges used in pipelines.

• Chemical Industry: Vital for connecting systems in chemical processing.

• Plumbing: Alloy steel forged flanges ensure durable connections.

• Heating Systems: Flat-faced forged flanges utilized in heating applications.

• Water Supply: Essential components in water distribution systems.

• Power Plants: Japanese JIS forged flanges used to handle high-pressure conditions.

• Paper & Pulp Industry: Forged plate flanges support heavy-duty operations.

• General Purpose: Versatile forged flanges for various applications.

• Fabrication: Steel forged flanges are crucial in manufacturing and construction.

• Food Processing: Ensures sanitary connections in food processing systems.

How to Order Forged Flanges?

Ordering forged flanges requires providing detailed specifications to ensure you get the right product for your application. When Ordering Specify:

Determine Specifications:

• Size: Measure the pipe's diameter to determine the appropriate flange size. The NPS does not always correspond to the flange inside diameter. B16.5 is for .5″-24″ NPS flanges, and B16.47 is for 26″-60″ flanges.

• Pressure Rating: Identify the required pressure rating (e.g., Class 150, 300, etc.) based on your system's operating pressure.

• Material: Choose the material (e.g., carbon steel, stainless steel) suitable for your application's temperature and corrosive environment.

• Bolts Holes: Indicate the number, size, and type of bolt holes. This is critical for flange compatibility with the mating component.

Select Flange Type:

• Types: Decide on the type of flange you need, such as Weld Neck (WN), Slip On (SO), Threaded (Thd), Socket Weld (SW), or Lap Joint (LJ). Reducing Flanges (RED), Long Weld Necks (LWN), and Stub Ends (SE) are a few more.

Identify Standards:

Specify Additional Requirements:

Gather Documentation:

Contact a Reliable Supplier:

• Research and select a reputable supplier known for high-quality products and reliable service. Guanxin Solutions, for instance, offers a range of forged steel flanges meeting various specifications.

Submit a Purchase Order:

• Provide a detailed purchase order with all the specifications, quantities, delivery timelines, and any special instructions.

Review and Confirm:

• Once you receive a quote, review it carefully to ensure all your requirements are met. Confirm the order and arrange for payment and delivery.

By following these steps and providing detailed specifications, you can ensure a smooth ordering process and receive the right forged flanges for your needs from Guanxin Solutions.

Why Choose Guanxin Flanges & Forgings Solutions?

Guanxin stands among the world's leading industrial companies, known for its responsive service and reliable flanges & forgings solutions. Our efficient in-house production and 24-hour service guarantee timely, budget-friendly delivery of top-quality flanges & forgings. We serve global clients, ensuring expedited orders and worldwide delivery without delay, meeting and exceeding your expectations.

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