This A105 stainless steel stub end lap flange is full of highlights. In terms of material, A105 carbon steel with stainless steel stub is selected, which gives consideration to strength and corrosion resistance, and can run stably under various complex working conditions. Exquisite manufacturing technology, through professional integral forging and high-precision CNC lathe turning, the size is accurate and the surface is smooth. It has excellent sealing performance and can effectively prevent medium leakage. Dimensions and specifications cover a wide range, from 1/2 inch to 24 inch (DN15-DN600), meeting the requirements of different pipe diameters. The pressure grade ranges from ANSI Class 150 to 600, which is suitable for various pipeline systems from low pressure to high pressure. In addition, it is an economical and effective scheme for stainless steel or nickel alloy pipes to be used with stub, and it can also be rotated to facilitate bolt alignment and convenient installation.
The product consists of two core parts—stub end (a short pipe section with a flared end) and lap flange (a flat, ring-shaped flange with bolt holes)—forming a detachable, low-stress connection structure:
Stub End Function: The stub end is welded to the main pipeline (e.g., carbon steel or stainless steel pipes), and its flared end (with a smooth sealing surface) overlaps with the lap flange. It acts as a "transition adapter" between the pipe and the flange, avoiding direct welding of the flange to the pipe (which reduces welding stress and deformation).
Lap Flange Function: The lap flange has no raised face (unlike weld neck flanges) and is designed with evenly distributed bolt holes. It clamps the stub end’s flared end to the mating flange (e.g., another lap flange or a flat-faced flange) via bolts, compressing the gasket to achieve a sealed connection.
Low Structural Stress: The lap design allows slight angular adjustment during installation (compensating for minor pipe misalignment) and reduces stress concentration at the connection—critical for pipelines that experience thermal expansion or vibration (e.g., water supply pipes, low-pressure steam pipes).
Depending on actual application needs, the material of the stub end and lap flange is usually optimized for performance and cost, with "A105" often serving as a benchmark for forging quality:
1. If Using A105 Carbon Steel (Common for Non-Corrosive Environments)
Forged Strength: A105 carbon steel is produced via forging (not casting), resulting in a dense grain structure. Its mechanical properties meet strict standards:
Tensile strength: ≥485 MPa;
Yield strength: ≥250 MPa;
Elongation: ≥22% (good ductility, avoiding brittle fracture under pressure). It withstands low-to-medium pressure (≤20MPa) and moderate temperatures (≤343°C), suitable for general industrial pipelines (e.g., oil refineries, chemical plants’ low-pressure process pipes).
Corrosion Resistance Enhancement: Since A105 is carbon steel (prone to rust in humid/chemical environments), it is often treated with hot-dip galvanizing, epoxy coating, or zinc plating to form a protective layer—extending service life in indoor dry environments or mild corrosive scenarios (e.g., municipal water supply pipelines).
2. If Using Stainless Steel (e.g., 304, 316) with A105 Forging Standards
Superior Corrosion Resistance: Stainless steel grades (304: 18Cr-8Ni; 316: 16Cr-10Ni-2Mo) form a dense chromium oxide passive film on the surface, resisting atmospheric humidity, salt spray, mild acids, and organic solvents. 316-grade variants are even suitable for coastal or chemical environments (e.g., seawater pipelines, acid waste water treatment pipes).
Forged Quality Compliance: Following A105’s forging requirements (e.g., no internal cracks, inclusions, or porosity), stainless steel stub end lap flanges have consistent mechanical properties—avoiding casting defects and ensuring reliable pressure-bearing capacity.
Specifications
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why choose us
Shandong Zechen Xinghua New Materials Co., Ltd. is a manufacture integratingproduction and trade, with more than 30 years of experience in high-quality pro-duction, providing one-stop service for global customers. The company specializesin the production and sales of Carbon steel pipe/bar/plate/coil/, Galvanized steelplate/coil, Stainless steel pipe/plate/coil/bar,Section steel(H-beams/T-beams/Chan-nel steels/Angle steels/Cross steels/Etc.)Rebar/Deformed steel bars,Aluminumplate/coil/pipe/bar,Copper/Brass/Bronze/Copper alloy and other metal prod-ucts.Among them, our precision seamless steel pipes and welded steel pipes ofvarious diameters have reached the world's leading level, with an annual exportvolume of over 100,000 tons.
At the same time, the company has close cooperation with large domestic steel mills such as Youfa, Baosteel, TiSCO, Shougang, Laigang, Shan Steel and Rizhao, with an annual sales volume of 500,000 tons. Products are exported to more than 60 countries and regions such as Europe, Middle East, Southeast Asia, Australia, Latin America and South Asia. We have won the recognition of customers with good reputation and good service.
Since its establishment, the company has always adhered to the business phi-losophy of "Integrity is our fundamental principle;Quality is our highest pur-suit;Service is our greatest commitment;", insisted on being yourself first, andthen doing good deeds, aiming at customer satisfaction, reputation first, andfocusing on providing customers with first-class products and meticulous andefficient services.Welcome customers to visit and negotiate. We look forward toestablishing a long-term win-win cooperation with you!
