High-Quality OEM Black Rhs: Custom CNC Punching and Welding
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Product Highlights
- Customizable Dimensions: Available in sizes from 20x20mm to 500x500mm with customized length options.
- Comprehensive Processing: Includes bending, welding, punching, cutting, laser cutting, and heat treatment services.
- Diverse Surface Treatment: Options include black, galvanized, painted, electrostatic spraying, and powder coating.
- International Standards Compliance: Manufactured in full compliance with ASTM, JIS, DIN, GB, and EN standards.
- Rapid Delivery for Stock Items: Standard goods shipped within 3 days after deposit payment.
- Free Sample Policy: Samples provided free of charge; freight fee deductible from formal orders.
- Strict Quality Control: Full-process quality control with traceable raw materials and responsible QC checks.
- Flexible Payment Terms: Accepts T/T (advance or against documents) and Irrevocable Sight L/C.
Product Attributes
- Customization
- Available
- Type
- Welded
- Technique
- ERW
- Model NO.
- 50*50 100*100 400*400
- Material
- Carbon Steel
- Surface Treatment
- Black/Galvanized/Painted
- Usage
- Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose
- Section Shape
- Square/Rectangular
- Standard
- ASTM, GB, JIS, DIN, BS, ASTM A106-2006
- Grade
- Q195-Q345;A53-A369;St35-St52;10#-45#;Q235;Q345
- Thickness
- 1mm-20mm
- Length
- 5.8m/6m/12m/ Customized
- Tolerance
- +/-5%
- Processing Service
- Bending, Welding, Punching, Cutting
- Secondary or Not
- Secondary or Not
- Pipe Ends
- Plain, Bevel, Threaded or Grooved
- Alloy or Not
- Non-Alloy
- Product Name
- Square and Rectangular Pipe, Tube
- Zinc Coating
- 220 G/M2 ( or Customized)
- End Protector
- None or Plastic Caps
- Payment Term
- LC/Tt
- Company Advantage
- Great Quality and Quick Delivery
- Certification
- ISO 9001 CE
- Transport Package
- Packed by Steel Strips
- Specification
- 20*20-500*500MM/20*40-300*500MM
- Trademark
- Yanfang
- Origin
- China
- HS Code
- 7306610000
- Production Capacity
- 50000 Tons Per Month
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Product Description

Commodity | Black Steel Square / Rectangular tube hollow section |
Square pipe Size | 20x20--500x500mm |
Rectangular Pipe size | 20x40--400x600mm |
Wall thickness | 0.5-20mm |
Length | 5.8m/6m or based on your request |
Standardand Grade | GB/T6728:2002 : Q195 , Q235 , Q345 EN10210, EN10219: S235JR ,S275JR,S355JR, S355J2H ASTM A500:GR. A , GR. B, GR. C , GR. D JIS G3466 : SS440,SS540 |
Surface | Black, or Galvanized and Oiled to prevent the rust |
End finish | Plain end |
Usage | Steel construction, mechanical, manufacturing, construction, automobile manufacturing,shipbuilding, electricity and more |
Packing | 1.Big OD:in bulk 2.Small OD:packed by steel strips 3.woven cloth with 7 slats 4.according to the requirements of customers |
Shipment | by bulk or load into 20ft / 40ft containers |
Delivery time | Within 20days or as your request |
Payment | 30% TT Deposit In Advance, The Balance Payable Against Copy Of B/L; Or Irrevocable Sight L/C. |
Square tube (mm) | Rectangular tube (mm) | Wall Thickness (mm) | Square tube (mm) | Rectangular tube (mm) | Wall Thickness (mm7) | |
19*19 | 1.0 | 40*135 50*140 60*130 75*125 40*150 | 50*150 60*140 80*120 100*100 | 1.5 | ||
1.2 | 1.7 | |||||
1.3 | 2.0 | |||||
1.4 | 2.2 | |||||
1.5 | 2.5~5.0 | |||||
1.7 | 5.25~6.0 | |||||
2.0 | 6.5~9.75 | |||||
20*20 25*25 | 20*30 | 1.0 | 11.5~16 | |||
1.2 | 50*160 60*150 60*180 65*180 70*150 90*150 90*160 100*120 100*125 100*140 | 60*160 80*140 80*160 100*150 120*120 110*110 120*180 125*125 | 2.5 | |||
1.3 | 2.75 | |||||
1.4 | 3.0~4.0 | |||||
1.5 | 4.25~4.75 | |||||
1.7 | 5.25~6.0 | |||||
1.8 | 6.5~7.75 | |||||
2.0 | 9.5~9.75 | |||||
2.2 | 10.5~11.75 | |||||
2.5~3.0 | 12.5~15.75 | |||||
32*32 35*35 20*50 | 20*40 25*40 30*30 30*40 | 1.0 | 16~~30 | |||
1.2 | 60*170 70*160 80*150 80*180 127*127 | 75*150 100*200 140*140 150*150 130*130 | 2.5 | |||
1.3 | 2.75 | |||||
1.4 | 3.0~5.75 | |||||
1.5 | 7.5~9.75 | |||||
1.7 | 10.5~11.75 | |||||
1.8 | 12.5~15 | |||||
2.0 | 60*200 60*220 80*200 80*220 100*180 120*160 120*200 | 100*250 160*160 180*180 140*180 150*170 150*180 150*200 | 2.5 | |||
2.2 | 2.75~3.25 | |||||
2.5~3.0 | 3.5~5.0 | |||||
3.5~3.75 | 5.25~7.75 | |||||
20*60 20*80 25*65 30*70 35*60 38*38 45*45 39*49 25*70 | 25*50 30*50 30*60 40*40 40*50 40*60 50*50 | 1.2 | 9.5~11.75 | |||
1.3 | 12.5~15.75 | |||||
1.4 | 16~~30 | |||||
1.5 | 100*350 125*250 130*250 135*135 140*240 150*220 225*225 | 100*300 150*250 200*200 200*250 | 2.75 | |||
1.7 | 3.0~3.25 | |||||
1.8 | 3.5~9.75 | |||||
2.0 | 11.5~11.75 | |||||
2.2 | 12.5~14.75 | |||||
2.5~4.0 | 15.5~15.75 | |||||
4.25~5.0 | 16~~30 | |||||
5.25~5.75 | 100*400 130*300 150*350 200*280 220*220 200*350 250*350 | 150*300 200*300 250*250 180*300 200*400 300*300 | 3.5~4.0 | |||
5.75~6.0 | 4.5~7.75 | |||||
30*100 40*70 40*90 50*60 50*75 50*90 55*55 65*65 | 40*80 40*100 50*70 50*80 60*60 60*80 70*70 | 1.3 | 9.5~11.75 | |||
1.4 | 12.5~14.75 | |||||
1.5 | 15.5~17.75 | |||||
1.7 | 4.75~11.75 | |||||
1.8 | 12.5~14.75 | |||||
2.0 | 15.5~17.75 | |||||
2.2 | 300*320 300*350 | 200*500 250*450 300*400 350*350 | 4.75~11.75 | |||
2.5~4.0 | 12.5~14.75 | |||||
4.25~5.0 | 15.5~17.75 |
5.25~5.75 | 18~~30 | |||||
5.75~6.0 | 200*450 250*400 250*500 300*450 | 200*600 280*280 300*500 350*400 400*400 | 4.5~5.75 | |||
40*120 40*140 50*110 50*120 50*125 70*100 85*85 | 50*100 60*90 60*100 60*120 75*75 80*80 80*100 90*90 | 1.3 | 6.5~11.75 | |||
1.5 | 12.5~14.75 | |||||
1.7 | 15.5~17.75 | |||||
1.8 | 18~~30 | |||||
2.0 | 300*700 300*650 320*320 | 300*600 400*500 400*600 450*450 500*500 | 4.5~7.75 | |||
2.2 | 9.5~9.75 | |||||
2.5~4.0 | 11.5~13.75 | |||||
4.25~5.0 | 14.5~15.75 | |||||
5.25~5.75 | 16.5~17.75 | |||||
7.5~9.75 | 18~~30 |






Have a strict product quality control system ,and we have a very professional team to ensure every detail in the trade process, which can greatly save your time and energy.
Our steel products are exported to more than 20 countries and regions in south east Asia, Africa, North America,South America, the Middle East.
Upholding the business philosophy of Quality First, Customer Oriented, we sincerely welcome long-term cooperation with global clients and partners.


A:We offer outstanding delivery efficiency: standard goods are shipped within 3 days after deposit payment, while customized products take 15–30 days for delivery.
Q2:Do you have quality control?
A: The email and fax will be checked within 24 hours,meanwhile,the Skype,Wechat and WhatsApp will be online in 24 hours.Please send us your requirement and order information,specification(Steel grade,size,quantity,destination port),we will work out a best price soon.
A: Yes absolutely we accept.
About the Supplier
This supplier has been audited by CTI. Verify the report on the official CTI website with ID "QIP-ASI266463". Items marked "" are certified.
Company Profile
Tangshan Yanfang Trading Co., Ltd. is located in Tangshan, China's largest steel manufacturing base and home to the largest port in North China.
As an integrated manufacturer and exporter, we specialize in galvanized steel products, steel pipes, steel coils, steel plates, steel profiles, and OEM metal fabrication services. Supported by our own processing facilities and long-term partner mills, we provide stable quality, competitive pricing, and reliable delivery.
Our products are manufactured in accordance with ASTM, JIS, DIN, API, and EN standards and are widely exported to Southeast Asia, Africa, the Middle East, North America, and South America.
We offer a full range of metal processing services, including cutting, slitting, laser cutting, punching, bending, welding, threading, machining, and surface treatments such as galvanizing, powder coating, painting, and anti-rust protection.
With over 11 years of export experience, strict quality control, and responsive customer service, we are committed to providing efficient one-stop steel solutions for customers worldwide.
We look forward to building a long-term partnership with you.
About Our Factory & Business Background
-
Business Type
- Trading Company
- Address
- Tangshan/Caofeidian/Zhegnyuandasha, Tangshan, Hebei, China
-
Plant Area
- 230.33 square meters
-
Number of Employees
- 4
-
Registered Capital
- 5,000,000 RMB
- Terms of Payment
- LC, T/T
- International Commercial Terms(Incoterms)
- FOB, EXW, CFR, CIF
-
Average Lead Time
-
Peak Season Lead Time: within 15 workdays
Off Season Lead Time: within 15 workdays -
Nearest Port
- Tianjin Port
-
Minimum Order Quantity
- 115 tons
-
Supply Chain Partners
- 6
Our Production Capability & Technical Expertise
- Main Products
- Hot Rolled Strip, Hot Rolled Coil, Galvanized Round ERW Steel Pipe, Galvanized Square Steel Pipe, Galvanized Steel Coil, Galvalume Steel Coil, Cold Rolled Steel Coil, Square Steel Pipe, Plastic-Coated Steel Pipe, Galvanized Steel Sheet
-
Customization Options
- Customization from Designs, Full Customization, Minor Customization, Flexible customization
-
OEM Service Available
- Yes
-
R&D Engineers
- 1 people
Our Industry Experience & Global Business Record
-
Year of Establishment
- 2021-02-22
-
Export Year
- 2 years
- Main Markets
- Mid East, Eastern Asia, Eastern Europe, Africa
-
Repeat Buyers Choice
- 50%~80%
-
Number of Foreign Trading Staff
- 1
-
Overseas Agent/Branch
- No
-
New Products Launched in Last year
- No
Our Certifications, Standards & Industry Recognition
-
Cooperated with Fortune 500
- No
FAQ
- Do you have quality control?
- Every process will be checked by responsible QC which insures every product's quality, We implement full-process quality control, with all raw materials traceable throughout the whole production chain.
- Do you provide samples?
- Samples are provided free of charge, while customers only need to bear the freight cost. This freight fee will be deducted from your formal order once we establish cooperation. For our regular and long-term cooperative customers, both samples and freight are completely free of charge.
- How do pay and payment option?
- Payment Terms: 1,100% T/T advance 2,30% T/T and balance against copy of documents. 3,30% T/T advance, balance L/C at sight.
- Can I go to China to inspect the factory?
- If you want to come to inspect the factory, our consultant will arrange the schedule for you. In addition, we support ZOOM videos for online factory inspection.
- Can you provide customized services?
- Our products can be customized and manufactured in full compliance with ASTM, JIS, DIN international standards.
- How can I get your quotation as soon as possible?
- The email and fax will be checked within 24 hours,meanwhile,the Skype,Wechat and WhatsApp will be online in 24 hours.Please send us your requirement and order information,specification(Steel grade,size,quantity,destination port),we will work out a best price soon.
- Do you accept the third party inspection?
- Yes absolutely we accept.
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