Production Process:

• Material Selection: We primarily source raw materials from leading steel mills such as Baosteel, TPCO, Yanbao, Baotou Steel, Changbao, and Huarun. We select tubes with smooth internal/external surfaces, uniform wall thickness, and a preference for higher manganese content to ensure a superior final appearance.

• Material Inspection: Incoming materials undergo dimensional checks and chemical composition analysis.

• Warehousing: Approved materials are stored in inventory.

• Cutting: Tubes are cut to length with sufficient machining allowance. Burrs and metal chips are removed.

• Bending & Forming: Tubes are heated using medium-frequency induction heaters and formed via pushing with precision dies. Dies are re-polished every 48 hours of operation to maintain strict dimensional tolerances.

• Heat Treatment: Stress relief annealing (tempering) is performed.

• End Machining: Bevels are cut on 90-degree CNC lathes to an angle of 37.5° ± 0.25°. The land (flat edge at the end of the bevel) is sized according to the pipe diameter. The land ensures a flush fit for butt welding and prevents burn-through during the TIG root pass.

• Visual Inspection: Surfaces are checked for defects like scratches, peeling, or pitting.

• Chemical Analysis: Composition is verified using imported handheld spectrometers.

• Dimensional Inspection: Checks include outside diameter, wall thickness, ovality, and straightness.

• Mechanical Testing: Tests include flattening and flaring to validate performance.

• Sandblasting: A fine grit is used to create a uniform surface finish without excessive pitting.

• Painting: Surfaces are evenly coated using environmentally friendly spray equipment.

• Marking: Legible black background with white lettering is applied using a marking machine.

• Packaging: Products are packed in wooden cases or on pallets, secured with steel strapping, and wrapped in plastic film for weather and dust protection.

• Shipping: Careful handling using forklifts and overhead cranes ensures secure and orderly loading for transport.

Quality Assurance & Company Profile:

1. Certifications: ISO 9001 Quality Management System, Environmental Management System, Occupational Health & Safety Assessment Series, AAA Credit Rating, and SGS International Certification.

2. Quality Control: An integrated international ERP system manages production, supplemented by a secondary manual quality inspection to guarantee a 100% pass rate.

3. Production Capacity: Annual output of 20,000 tons of pipe fittings.

4. Facilities & Workforce: 7,000 sqm storage warehouse and a team of 200 employees.

5. R&D & Customization: A 300 sqm sample room supports our in-house R&D and ODM/ custom manufacturing capabilities.

6. Service: We offer straightforward cooperation, responsive service, and efficient logistics.

7. Experience: A decade of expertise in international export.

Product Details:
Place of Origin:China 
Brand Name:Gangyu Pipeline 
Certification:MTC/COC/ISO/CE 
Model Number:88.9*5.49
Payment & Shipping Terms:
Minimum Order Quantity:1pc 
Price:negotiation 
Packaging Details:Packed in wooden pallet 
Delivery Time:10 working days after received your payment 
Payment Terms:T/T, LC, western Union 
Supply Ability:50,000pcs per month 
 Product Name:Carbon Steel Elbow Connection:Butt Welding 
Shape:Round Material:Carbon Steel 
Degree:180 Standard:ASME/GB/EN/JIS/IS 
Size:1/2-72inch Wall Thickness:Sch10-sch160 


Seamless Carbon Steel Tube Elbows , Butt Weld Steel 90 Degree Elbow
Description:
1. Elbow: Long Radius 90 Deg, 45 Deg,180 Deg ; Short Radius 90 Deg, 45Deg,180 Deg
    Our Butt Weld Pipe Fittings can supply as clients draft drawing.
2. Size Range
    Seamless Fittings : 1/2inch to 24 inch
    Weld Fittings: 2 inch  to 72 inch
3. Wall Thickness
    SCH10,SCH20,SCH30,SCH40,STD,SCH60,SCH80,XS,SCH100,SCH120,
    SCH140,SCH160,XXS. SGP, DIN
4. Material
A234 WPB , C, A420 WPL6, WPL3,WPL8,WPL9; A234 WP1, WP265GH ,WP12. WP5, WP9, WP91,WP911, A403 WP304 ,WP304L, A403 WP316, WP316L; A420 WP3, WP6; A860 WPHY 42, WPHY 52, WPHY 60, WPHY 65, WPHY 70; st37.0,st35.8; SUS304, SUS304L,SUS316,SUS316L.
5. End Treatment
    Bevel Ends , Plain Ends , or as per Clients Requirments
6. Surface Treatment and Packing
    Sand Blast, Paint Black Lacquer or Transparent Oil .
    Wooden Case or Wooden Pallet or as per customers' requirements.
Specifications:
nominal diameter outside diameter center to end center to center back to face 
45° 90° elbow 180° elbow 180° elbow 
elbow 

Production process of elbow fittings:

Select material (we preferred baosteel, tianjin TPCO, smoke treasure, baotou steel, Chang Bao, CRC steel raw materials, such as requirements within the outer diameter is smooth, uniform wall thickness, selection of high manganese steel pipe to ensure that products beautiful) - material inspection (measurement, chemical composition inspection) - storage - material cutting (leave enough machining allowance, removing iron and burr) - intermediate frequency heater variable diameter and bending forming (mold push every 48 hours after grinding, ensure dimensional tolerance control) - heat treatment (tempering process) - end processing (37.5 + 0.25) bevel Angle - visual inspection (appearance without injury, peeling,Pockmark) - chemical composition analysis (imported hand-held spectrometer) - dimensional inspection (outer diameter, wall thickness, ovality, straightness) - mechanical performance test (squashed, flaring) - sand (fine sand in order to ensure that the surface pitting not too - spray paint (environmental protection coating equipment coating surface evenly) - printing (code printer code on a black, white, bright font) - packing (fixed wooden cases or pallet packaging, packaging tapes, plastic film outside package water-proof, dust) - product check (forklift trucks, lifting transport, light with light, neat)