TOBO STEEL GROUP CHINA
| Finish | Pickled, Polished |
| Endtype | Butt Weld End |
| Payment Terms | T/T, Western Union |
| Technics | Casting |
| Types | Seamless |
| Processing Method | Cold rolled and Annealed |
| Supply Ability | 10 Ton/Month |
| Product Name | ASTM A403 316L Stainless Steel Stub Ends ASME B16.9 Lap Joint |
| Manufacturing Process | Push, Press, Forge, Cast, etc. |
| Delivery Time | 15-30 Workdays |
| Thickness | Sch 5S, Sch 10S, Sch 40S, Sch 80S |
| andyhuang@cnjdgy.com | |
| Pressure | 3000LB, 6000LB, 9000LB |
| Type | Stub End |
| Pressure Rating | 3000/6000/9000 PSI |
| End Type | Short Pattern, Long Pattern |
| Wall Thickness | SCH5S~XXS |
| Packaging Details | Standard Shipping Package |
| Surface Treatment | Pickling, Polishing, Sandblasting |
| Material | Stainless Steel (commonly SS304, SS316) |
| Model Number | Stainless Steel Stub Ends |
| Brand Name | TOBO |
| Certification | ISO/TUV/SGS |
| Place of Origin | Shanghai,China |
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Product Specification
| Finish | Pickled, Polished | Endtype | Butt Weld End |
| Payment Terms | T/T, Western Union | Technics | Casting |
| Types | Seamless | Processing Method | Cold rolled and Annealed |
| Supply Ability | 10 Ton/Month | Product Name | ASTM A403 316L Stainless Steel Stub Ends ASME B16.9 Lap Joint |
| Manufacturing Process | Push, Press, Forge, Cast, etc. | Delivery Time | 15-30 Workdays |
| Thickness | Sch 5S, Sch 10S, Sch 40S, Sch 80S | andyhuang@cnjdgy.com | |
| Pressure | 3000LB, 6000LB, 9000LB | Type | Stub End |
| Pressure Rating | 3000/6000/9000 PSI | End Type | Short Pattern, Long Pattern |
| Wall Thickness | SCH5S~XXS | Packaging Details | Standard Shipping Package |
| Surface Treatment | Pickling, Polishing, Sandblasting | Material | Stainless Steel (commonly SS304, SS316) |
| Model Number | Stainless Steel Stub Ends | Brand Name | TOBO |
| Certification | ISO/TUV/SGS | Place of Origin | Shanghai,China |
| High Light | ASTM A403 stainless steel stub ends ，316L lap joint stub ends ，ASME B16.9 stainless steel fittings | ||
ASTM A403 316L Stainless Steel Stub Ends ASME B16.9 Lap Joint
1.Product Description
Stainless Steel Stub Ends, also known in engineering as “Lap Joint Stub Ends” or “Von Roll-type flanged pipe ends,” are essentially stress-decoupled piping connection elements. Structurally, they separate the "pressure-retaining sealing function" from the "bolt-fastening function": the stub end withstands media pressure, corrosion, and erosion, while the lap joint flange ring exclusively provides bolt fastening loads. This design ensures that weld stresses and flange sealing stresses do not superimpose or interfere with each other when the piping system experiences extreme temperature differentials or mechanical vibrations. The products are manufactured in accordance with the three major global standard systems: American (ASME B16.9 / MSS SP-43), German (DIN EN 1092-1 / DIN 2673), and Japanese (JIS B2311 / B2220), enabling seamless integration into diverse export and domestic engineering projects. points.
2.Product Applications
This product is specifically engineered for the following four typical extreme service conditions and special scenarios:
Cryogenic and Ultra-Low Temperature Pipelines (-196℃ for LN₂/LNG): Used in LNG receiving terminals and air separation unit liquid nitrogen transfer lines. Austenitic stainless steel stub ends maintain excellent impact toughness at low temperatures. When paired with lap joint flanges, they effectively compensate for the massive axial contraction caused by cold shrinkage, preventing brittle fracture.
High-Temperature Heavy Oil and Steam-Traced Lines (≥400℃): Used in refinery atmospheric/vacuum distillation units and catalytic cracking high-temperature hydrocarbon gas lines. Long-pattern stub ends position the butt-weld far from the high-temperature lap stress zone, preventing flange sealing face failure due to high-temperature creep.
High-Erosion and Solid-Bearing Slurry Pipelines: Used in mining and metallurgy slurry transport and desulfurization limestone slurry circulation lines. The smooth inner bore of the stub end has no weld protrusions, eliminating slurry deposition and localized vortex erosion. After wear, only the stub end needs replacement, not the expensive large-bore flange.
Ultra-High Vacuum Systems (≤10⁻⁵ Pa): Used in semiconductor and photovoltaic industry vacuum chamber evacuation lines. The lap sealing face is ultra-finished and paired with oxygen-free copper gaskets or metallic C-rings to achieve extremely low outgassing rates and leak rates under ultra-high vacuum.
3.Product Advantages
| Engineering Point | This Product Solution |
| Dissimilar Metal Welding Issues | Eliminates the need to directly weld SS pipes to CS flanges. Simply purchase both materials separately and connect mechanically via bolts, completely avoiding galvanic corrosion and embrittlement risks at dissimilar metal weld seams. |
| Large-Bore Flanges Cannot Be Hot-Bent On-Site | The lap joint flange rotates independently of the pipe. Installation does not require heating or overall hoisting/turning of large-bore pipes. Simply rotate the flange ring to align bolts across the center, drastically reducing installation man-hours. |
| Insufficient Axial Thermal Compensation | The reserved fit clearance (typically 1~2mm) allows the pipe to slide freely in the axial direction, acting as a simplified axial expansion joint, reducing reliance on expansion loops or metal bellows compensators. |
| Excessive Equipment Nozzle Loads | Since no bending moment is transmitted (the lap joint flange is not welded), massive bending moments from pipe deadweight or thermal expansion are not directly transferred to equipment nozzles, effectively protecting pump and compressor inlet/outlet nozzles from overload fractures. |
| Low Inventory Turnover Efficiency | Standardize on one flange ring size (e.g., PN16/Class 150) and stock only stub ends in different materials (304/316L/Duplex). This achieves a "one ring fits multiple materials" flexible release strategy. |
4.Key Product Specifications
| Parameter Dimension | US Standard (ASME) | German/European (DIN/EN) | Japanese (JIS) | Our Factory Selection Recommendations |
| Dimension Standard | ASME B16.9 / B16.28 | DIN 2616 / EN 12560-3 | JIS B2311 / B2312 | Prioritize ASME for Americas exports; DIN for European projects |
| Lap OD (A) Tolerance | ±1.6mm (NPS ½~48) | ±2.0mm (DN15~1200) | ±2.0mm (15A~600A) | When mixed, prioritize matching by DN/PN labeling |
| Wall Thickness System | Sch 5S / 10S / 40S / 80S | Series 1 / Series 2 (PN-based) | STD / XS / XXS | Strictly procure by drawing Sch or mm wall thickness; do not mix systems |
| Pressure-Temperature Rating | Limited by mating flange, Class 150~2500 | Limited by mating flange, PN 6 ~ PN 400 | Limited by mating flange, 10K ~ 40K | For high-temp (>350℃), de-rate; refer to ASME B16.5 Appendix |
| Lap Root Fillet Radius (Critical) | R ≥ 3.0mm (smooth transition) | R ≥ 3.0mm (same as ASME) | R ≥ 2.5mm (slightly sharper) | Too small R causes stress concentration; confirm tooling before ordering |
| Mating Flange ID Clearance | Approx. 1.6mm larger than stub OD | Approx. 2.0mm larger than stub OD | Approx. 1.5mm larger than stub OD | Insufficient clearance causes high-temp seizure; excessive causes eccentricity |
| NDE (Non-Destructive Exam) Level | Optional PT/MT; RT on demand | Mandatory PT/MT (DIN EN 10204 3.1 cert) | PT mandatory | For critical cases, add 100% UT thickness verification to check lap thinning |
| Material Impact Test Temp | -29℃ (non-mandatory but recommended) | -20℃ / -40℃ (EN 13445 mandatory) | -10℃ / -20℃ | LNG projects MUST require -196℃ low-temperature impact test reports |
FAQ
1. Are you trading company or manufacturer ? We are manufacturer ,You can see the certification.
2.How long is your delivery time? Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
3. Do you provide samples ? is it free or extra ? Yes, we could offer the sample for free charge but need pay the cost of freight.
4. What is your terms of payment ? Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.
Company Details
Business Type:
Manufacturer,Agent,Importer,Exporter,Trading Company,Seller
Year Established:
1998
Total Annual:
100000-100000000
Employee Number:
200~300
Ecer Certification：
Verified Supplier
TOBO GROUP sales head offce in Shanghai. We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area ... TOBO GROUP sales head offce in Shanghai. We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area ...
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