Industrial Pipe Elbows for High-Pressure and Corrosive Piping Systems
Industrial piping systems need stable wall strength and precise angles to handle fluid pressure and temperature changes. Our industrial pipe elbows are made using hot or cold forming methods. This keeps the wall thickness even across the bend to prevent stress points. Available in butt-weld, socket-weld, and threaded types, these fittings connect directly into ASME and DIN piping networks for chemical plants, power stations, and oil and gas pipelines.
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![ASME Elbow]()
ASME ElbowHAIHAO brand provides butt-welding elbows conforming to ASME B16.9, used for changing the flow direction in industrial piping systems. The product size ranges from 1/2 inch to 48 inches, with...
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![Steel Pipe Elbow]()
Steel Pipe ElbowBrand Name：HAIHAO
Habitat：CHINA
Execution Standard：ASME B16.9、GOST 17375、GOST 30753、DIN2605 -
![90 Degree Steel Elbow]()
90 Degree Steel ElbowThe 90 degree steel elbow is made for butt-weld piping where a full right-angle turn is needed without changing the pipe size. The range in the sheet starts at NPS 1/2 inch and goes up to NPS 48 inch.
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![45 Degree Steel Elbow]()
45 Degree Steel ElbowIt is used when a pipeline needs a softer change in direction instead of a full 90 degree turn. The table covers NPS 1/2 inch through NPS 48 inch.
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![GOST Elbow]()
GOST ElbowGost elbows – HAIHAO China. GOST 17375/30753. For oil/gas, chemical, power piping. DN15–1000 (21.3–1016mm), wall 2–60mm. 45°/90°/180°, R=1.0–5D, BW ends. Carbon/Stainless/Alloy steel. 1000 t/m...
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![Din Elbow]()
Din ElbowDIN2605 Butt-Welding Elbow
90°/45°/180° · R=1.0D/1.5D
DN200–600 (ø219.1–610mm)
Wall Thickness: 3–40mm (Series 1–5)
Pressure Factor: 62–97%
Materials:... -
![Stainless Steel Weld Elbow]()
Stainless Steel Weld ElbowExecution Standard：ASME B16.9、GOST 17375、GOST 30753、DIN2605
Type/Model：90°,45°,180°; 1.0D、1.5D、3D
Wall Thickness Class：SCH10S、SCHSTD、SCH40S、SCH80S、SCHXS
Product Types
Long Radius (LR) 90° Elbows:
1.5 times the pipe size radius that reduces fluid friction and pressure drop in fast-flowing process lines.
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Short Radius (SR) 90° Elbows:
1.0 times the pipe size radius built for tight spaces in skid units and small mechanical rooms.
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45° Elbows:
Used to change pipe direction slightly without blocking flow in complex routing layouts.
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180° Return Bends:
Used in heat exchanger coils that require a complete U-turn for fluid flow.
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Reducing Elbows:
Connects two different pipe sizes while changing direction, reducing the number of weld joints needed in a system.
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Materials & Standards
Stainless Steel: ASTM A403 WP304/304L, WP316/316L, WP321, WP310S. Resists rust and corrosion in chemical and pharmaceutical fluid systems.
Carbon Steel: ASTM A234 WPB, WPC; ASTM A420 WPL6 for cold temperatures down to -46°C. Available in normalized and stress-relieved conditions.
Alloy Steel & Special Alloys: ASTM A234 WP11, WP22, WP91; UNS N06625, UNS N08825, Duplex Stainless Steel UNS S31803 and S32750.
Dimensional Standards:
Butt-weld: ASME B16.9, MSS SP-43, ISO 3419, DIN 2605.
Forged, Threaded, and Socket-weld: ASME B16.11, BS 3799.
Wall Thickness Schedules: Sch 5S, Sch 10S, Sch 40, Sch 80, Sch 160, XXS.
Technical Specifications
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Technical Parameter |
Standard Specification |
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Size Range – Seamless |
1/2 inch to 24 inch (DN15 to DN600) |
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Size Range – Welded |
26 inch to 72 inch (DN650 to DN1800) |
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Wall Thickness Tolerance |
Maximum reduction of 12.5% at the thinnest point, in accordance with ASME B16.9 |
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End Preparation |
Plain ends or beveled ends according to ASME B16.25 |
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Welding Compatibility |
End preparation suitable for root-pass TIG welding and fill-pass welding |
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Surface Finish – Stainless Steel |
Pickled and passivated |
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Surface Finish – Carbon & Alloy Steel |
Shot-blasted with anti-rust black paint or clean oil coating |
Applications
Oil & Gas Refineries:
Upstream and downstream pipelines handling crude oil, gas, and refined products under high pressure.
Power Generation:
Main steam pipes, boiler water feed lines, and plant auxiliary systems operating at high temperatures.
Chemical Plants:
Acid, caustic, and solvent transport lines that need strong chemical resistance.
Water Treatment:
High-pressure reverse osmosis water systems and municipal seawater intake lines.
Forming Process:
Hot mandrel bending and cold press forming done at controlled temperatures to prevent micro-cracks and excessive wall thinning on the outer bend.
Heat Treatment:
Solution annealing for stainless steel; normalizing, quenching, and tempering for carbon and alloy steel to restore metal strength after forming.
Dimensional Inspection:
100 percent check of outer diameter, inner diameter, wall thickness, bevel angle, and roundness using laser tools and ultrasonic thickness meters.
Non-Destructive Testing:
Radiographic testing (RT) on weld seams, ultrasonic testing (UT) on thick walls, and positive material identification (PMI) spectrometer testing to check metal grades.
Documentation:
Material Test Reports (MTR) provided under EN 10204 3.1, showing chemical composition and mechanical test results matching the heat number on each fitting.
Custom Angles: Non-standard angles like 30 degrees or 60 degrees, special reducing ratios, and exact center-to-face dimensions made from customer drawings.
Special Beveling: J-prep, compound bevels, or special root faces made for automatic orbital welding machines.
Third-Party Inspection: Welcome customer-appointed inspection companies like SGS, BV, TUV, or DNV for factory checks before shipment.
Packaging & Delivery
Export Packaging:
Fumigation-free wooden crates, strong plywood boxes, or steel-banded wooden pallets lined with plastic moisture protection.
Protection Caps:
Plastic caps fitted on all bevels and threads to stop damage and keep dirt out during transport.
Logistics Support:
Container shipping (FCL and LCL) and air freight help with complete shipping documents, including commercial invoice, packing list, certificate of origin, bill of lading, and material test reports.
FAQ
Q: How do you control wall thinning at the outer bend during production?
A: We control wall thinning by managing the push speed and heating temperature during mandrel forming. We select the starting pipe thickness based on math formulas so that the thinnest point on the outer bend meets or exceeds the minimum wall thickness required by ASME B16.9 after forming.
Q: Can you provide NACE MR0175 compliant elbows for sour gas service?
A: Yes. For carbon and low-alloy steel elbows used in sour oil and gas fields, we use steel with controlled chemical limits for sulfur, phosphorus, and carbon. We perform post-weld heat treatment and hardness tests (maximum 248 HV10) to meet NACE MR0175 rules.
Q: What documents come with each shipment?
A: Every shipment includes a Material Test Report certified to EN 10204 3.1. The report lists chemical composition, tensile strength, yield strength, elongation, hardness test values, heat treatment records, and test results matched to the heat number stamped on the fitting.
Q: What is the difference between long radius and short radius elbows?
A: Long radius elbows have a center distance equal to 1.5 times the nominal pipe size, which lowers flow resistance and pressure drop. Short radius elbows have a center distance equal to 1.0 times the nominal pipe size, and are used only when physical space is too small for long radius fittings.
Q: Do you test all stainless steel and alloy elbows for material grade?
A: Yes. We perform 100 percent PMI testing using X-ray fluorescence analyzers on all stainless steel grades like 304 and 316, and special alloys like Duplex and Inconel, to verify the exact metal composition before packing.
Q: What end preparations are available for butt-weld elbows?
A: Standard butt-weld elbows come with beveled ends following ASME B16.25, using a 37.5 degree angle and a 1.6 mm root face. We also machine custom J-prep edges, compound bevels, or square cuts based on your welding procedure specifications.
Q: What is your lead time for standard and custom pipe elbows?
A: Stock items in common sizes like ASTM A234 WPB and ASTM A403 WP316 in schedule 40 and schedule 80 ship within 7 to 14 business days. Custom shapes, special alloy grades like titanium or Inconel, or non-standard wall thicknesses take 25 to 40 days based on raw material availability and third-party inspection steps.
As one of the most professional pipe elbow manufacturers and suppliers in China, we are able to meet the needs of the majority of our customers. Please rest assured to wholesale high quality pipe elbow made in China here from our factory. For price consultation, contact us.
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