DN 300 SCH10S ASTM A928M – UNS S31803 CLASS 1 BEVELENDS ASME B36.19M PIPE FLANGE: A Comprehensive Analysis
1. Introduction
In the intricate network of industrial piping systems, pipe flanges are crucial components that ensure secure connections, facilitate maintenance, and enable the smooth flow of fluids or gases. The DN 300 SCH10S ASTM A928M – UNS S31803 CLASS 1 BEVELENDS ASME B36.19M PIPE FLANGE represents a specific type of flange with unique characteristics tailored to meet the demands of various industries. This article delves into the details of this flange, exploring its dimensions, material properties, manufacturing standards, and applications.
2. Dimensions and Specifications
2.1 DN 300: Understanding the Nominal Diameter
The “DN 300” in the flange’s description refers to the nominal diameter. Nominal diameter is a standardized way of designating the size of a pipe or flange, which is not necessarily the exact inner or outer diameter. In the case of DN 300, it provides a common reference point for engineers and manufacturers to ensure compatibility within a piping system. For pipes and flanges with a DN 300 rating, they are designed to mate with other components of the same nominal diameter, allowing for seamless integration in a variety of applications.
2.2 SCH10S: Significance of the Pipe Schedule
The “SCH10S” notation indicates the pipe schedule and the type of material related to the wall thickness. The pipe schedule (SCH) is a numerical designation that correlates to the wall thickness of a pipe. SCH10S specifically implies a relatively thin – walled construction, which is suitable for certain applications where the internal pressure is not extremely high, but still requires a certain level of strength and durability. The “S” in SCH10S is used to denote that the flange is made of stainless steel, following the convention in ASME standards. This helps in differentiating it from carbon steel or other alloy flanges with similar pipe schedules but different material compositions.
3. Material Composition: UNS S31803
3.1 Chemical Makeup of UNS S31803
UNS S31803 is a duplex stainless steel, which means it has a microstructure consisting of approximately equal amounts of austenite and ferrite phases. Its chemical composition is carefully balanced to provide a unique set of properties. It contains around 22% chromium (Cr), which is a key element for corrosion resistance. Chromium forms a passive oxide layer on the surface of the material when exposed to oxygen, protecting it from further oxidation and corrosion. Molybdenum (Mo) is present in the range of 3 – 3.5%, enhancing the alloy’s resistance to pitting and crevice corrosion, which are common forms of corrosion in industrial environments. Nickel (Ni) is typically in the range of 4.5 – 6.5%, contributing to the overall strength and corrosion resistance, especially in reducing environments. Nitrogen (N) is added in the range of 0.14 – 0.20%, which helps in strengthening the austenite phase and further improving the corrosion resistance, particularly in acidic media.
3.2 Mechanical and Corrosion Resistance Properties
UNS S31803 offers excellent mechanical properties. It has a high tensile strength, typically in the range of 655 – 758 MPa (95,000 – 110,000 psi), and a yield strength of around 310 – 380 MPa (45,000 – 55,000 psi). The elongation at break is approximately 30 – 40%, indicating good ductility. This combination of strength and ductility allows the flange to withstand significant mechanical stresses during operation.
In terms of corrosion resistance, UNS S31803 outperforms many traditional stainless steels. It offers exceptional resistance to uniform corrosion in a wide range of environments. Its resistance to pitting and crevice corrosion is remarkable due to the combined effect of chromium, molybdenum, and nitrogen. In environments containing chlorides, which are common in many industrial applications such as the chemical industry and seawater – related applications, the alloy shows high resistance to chloride – induced stress corrosion cracking. This makes it highly suitable for use in piping systems where the fluid being transported may be corrosive.
4. Manufacturing Standards
4.1 ASTM A928M
The ASTM A928M standard plays a crucial role in the manufacturing of flanges made of UNS S31803. ASTM (American Society for Testing and Materials) standards are widely recognized globally for their strict quality control and testing procedures. ASTM A928M specifically pertains to stainless steel flanges and fittings made of duplex and super – duplex alloys. This standard outlines the requirements for chemical composition, mechanical properties, and manufacturing processes. It ensures that the flanges produced meet a high level of quality and consistency. Manufacturers must adhere to the guidelines set in ASTM A928M to ensure that the flanges are suitable for use in demanding industrial applications. For example, the standard may specify the allowable tolerances in dimensions, the type of heat treatment required to optimize the material’s properties, and the testing methods to verify compliance.
4.2 ASME B36.19M
ASME B36.19M is another important standard that the DN 300 SCH10S flange adheres to. This standard is focused on stainless steel pipe dimensions, tolerances, and other characteristics. It provides a comprehensive set of rules for the sizing and manufacturing of stainless steel pipes and flanges. The standard defines the outer diameter (OD), wall thickness, and other dimensional parameters for different nominal diameters, including DN 300. It also sets tolerances for these dimensions to ensure interchangeability of components within a piping system. ASME B36.19M covers not only the dimensions but also the material requirements, manufacturing methods, and quality control aspects related to stainless steel pipes and flanges. Compliance with this standard is essential for ensuring the safe and efficient operation of piping systems in industries such as oil and gas, chemical, and power generation.
5. Bevel Ends: Design and Function
The bevel ends on the flange are an important design feature. Beveling the ends of the flange is done to facilitate welding. When connecting two pipes or a pipe and a flange using a butt – weld joint, the beveled ends provide a larger surface area for the weld. This allows for a stronger and more reliable weld connection. The angle of the bevel is typically standardized, and for most industrial applications, it is designed to ensure proper penetration of the weld filler material. The bevel ends on the DN 300 SCH10S ASTM A928M – UNS S31803 CLASS 1 BEVELENDS ASME B36.19M PIPE FLANGE are machined to precise specifications to meet the requirements of the welding process. This ensures that the weld joint can withstand the internal pressure and mechanical stresses imposed on the piping system during operation.
6. Applications
6.1 Chemical Industry
In the chemical industry, where a wide variety of corrosive substances are processed, transported, and stored, the DN 300 SCH10S ASTM A928M – UNS S31803 CLASS 1 BEVELENDS ASME B36.19M PIPE FLANGE finds extensive use. Piping systems in chemical plants often carry acids, alkalis, and other highly reactive chemicals. The corrosion – resistant properties of UNS S31803 make these flanges suitable for such applications. For example, in a plant that produces fertilizers, the piping system may transport sulfuric acid, phosphoric acid, or ammonia. The flanges need to withstand the corrosive effects of these chemicals over an extended period. The bevel ends enable secure welding of the flanges to the pipes, ensuring a leak – tight connection and preventing any potential spills or leaks that could have serious environmental and safety implications.
6.2 Oil and Gas Industry
The oil and gas industry also relies heavily on high – quality flanges like this. In upstream operations, such as in oil and gas wells, the flanges are used in wellhead assemblies and pipelines. The harsh environment of the well, with high pressures, corrosive well fluids (which may contain sulfur – bearing compounds, chlorides, and acids), requires components with excellent corrosion resistance and mechanical strength. The UNS S31803 flanges can withstand these conditions, ensuring the integrity of the wellhead and pipeline systems. In mid – stream and downstream operations, such as in pipelines that transport crude oil, refined products, or natural gas, the flanges are used at various connection points. The DN 300 size is suitable for medium – to – large – diameter pipelines, and the SCH10S wall thickness provides the necessary strength while being cost – effective for applications where the pressure is not extremely high.
6.3 Power Generation
In power generation plants, whether they are fossil – fuel – fired, nuclear, or renewable energy – based, reliable piping systems are essential. In fossil – fuel – fired power plants, the flanges may be used in the piping systems that transport steam, water, and fuel. Steam pipelines operate at high temperatures and pressures, and the mechanical strength of the UNS S31803 flange is sufficient to withstand these conditions. The corrosion – resistance properties are also important, as the steam and water may contain impurities that could cause corrosion over time. In nuclear power plants, the flanges are used in the primary and secondary cooling systems. The cooling water in these systems may contain trace amounts of chemicals and radioactive substances. The DN 300 SCH10S ASTM A928M – UNS S31803 CLASS 1 BEVELENDS ASME B36.19M PIPE FLANGE’s resistance to corrosion and its ability to maintain a secure connection are crucial for the safe and efficient operation of the power plant.
7. Conclusion
The DN 300 SCH10S ASTM A928M – UNS S31803 CLASS 1 BEVELENDS ASME B36.19M PIPE FLANGE is a specialized component with unique dimensions, material properties, and manufacturing standards. Its nominal diameter of DN 300 and SCH10S wall thickness make it suitable for a range of applications where a balance between size, strength, and cost – effectiveness is required. The use of UNS S31803 duplex stainless steel provides excellent mechanical and corrosion – resistance properties, allowing it to withstand harsh industrial environments. Compliance with ASTM A928M and ASME B36.19M standards ensures high – quality manufacturing and compatibility within piping systems. The bevel ends of the flange facilitate reliable welding, further enhancing the integrity of the piping connections. As industries continue to demand efficient and safe piping systems, components like this flange will play an increasingly important role in ensuring the smooth operation of industrial processes.
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Product Name WELDING NECK FLANGE
Standard ASME/ANSI B16.5/16.36/16.47A/16.47B, MSS S44, ISO70051, JISB2220, BS1560-3.1, 7S-15, 7S-43, 605, EN1092
Type WELDING NECK FLANGE SPECIAL FLANGE: According to the drawing Picture
Materials
Nickel Alloy: ASTM/ASME S/B366 UNS N08020, N04400, N06600, N06625, N08800, N08810, N08825, N10276,N10665,N10675, Monel 400 & 500, Inconel 600 & 625, Incolloy 800, 825, Hastelloy C22,C276
Super Stainless Steel: ASTM/ASME S/A182 F44, F904L, F317L,
Stainless steel: ASTM/ASME S/A182 F304, F304L, F304H, F316, F316L, F321, F321H, F347H
Duplex Steel: ASTM A182 F51, F53, F55
Alloy Steel: ASTM/ASME S/ A182 F11, F12, F22, F5, F9, F91
ASTM A350 LF1; LF2; A350 LF3 ;LF4;LF6;LF8
Copper Alloy:ASTM AB564 , NO6600/ Alloy 600, NO6625/ Alloy 625, Alloy 690, Alloy 718
Inconel Alloy Steel:ASTMAB564, NO8800/Alloy800, NO8810/Alloy800H, NO8811/Alloy 800HT
Carbon Steel: ASTM/ASME S/A105, ASTM/ASME S/A350 LF2, ASTM/ASME S/A694/A694M, F42, F52, F56, F60, F65, F70….ASTM/ASME S/A350 LF2, ASTM/ASME S/A694/A694M, F42, F52, F56, F60, F65, F70….
Dimension (150#,300#,600#): DN15-DN1500
900# : DN15-DN1000
1500#: DN15-DN600
2500#:D N15-DN300
Marking Supply Logo + Standard + Size(mm) + HEAT NO +or as your requirement
Test Chemical Component Analysis, Mechanical Properties, Metallurgical Analysis, Impact Testing, Hardness testing , Ferrite Testing, Intergranular corrosion testing, X-ray Inspection (RT), PMI, PT, UT, HIC & SSC test, etc. or as your requirement
Brand TOBO
Certificates 3.1. (Any third party certificate should be clarified before order)
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WELD NECK FLANGES also called a tapered hub flange or high-hub flange, is a kind of flange that can relocate stress to the pipes, ensuring a decrease in high-stress concentration at the bottom of the flange.
WELD NECK FLANGES are flanges that designed to be jointed to a pipeline by butt welding. The neck, or hub, transmits stresses to the pipeline, reducing stress concentrations at the base of the weld neck flange. The bore of the Weld-Neck flange matches the bore of the pipe, reducing turbulence and erosion.
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related flange WN.jpg
ADVANTAGE WN01.jpg08.jpg09.jpg