Factory Sales Q235 4mm Diameter st45 st37 Hot Rolled Welded Carbon Steel Pipe
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Type
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Carbon Welded Steel Pipe | |
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Materials
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API 5L /A53 /A106 GRADE B and other material which client inquired
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Size
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Outer Diameter
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17-914mm 3/8"-36"
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Wall Thickness
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SCH10 SCH20 SCH30 STD SCH40 SCH60 XS SCH80
SCH100 SCH120 SCH140 SCH160 XXS |
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Length
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Single random length/Double random length
5m-14m,5.8m,6m,10m-12m,12m or as customer's actual request |
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Ends
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Plain end/Beveled,protected by plastic caps on both ends, cut quare,grooved,threaded and coupling,etc.
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Surface Treatment
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Bare,Painting black,varnished,galvanized,anti-corrosion 3PE PP/EP/FBE coating
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Technical Methods
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Hot-rolled/Cold-drawn/Hot-expanded
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Testing Methods
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Pressure test,Flaw detection,Eddy current testing, Hydro static testing
or Ultrasonic examination and also with chemical and
physical property inspection |
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Packaging
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Small pipes in bundles with strong steel strips,large pieces in loose; Covered with plastic woven
bags; Wooden cases;Suitable for lifting operation;Loaded in 20ft 40ft or 45ft container or in bulk; Also according to customer's requests |
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Origin
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China
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Application
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Conveying oil gas and water
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Third Party Inspection
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SGS BV MTC
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Trade Terms
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FOB CIF CFR
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Payment Terms
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FOB 30%T/T,70% before shipment
CIF 30% pre-payment and the balance to be paid before making shipment or Irrevocable 100% L/C at sight |
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MOQ
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10 tons
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Supply Capacity
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5000 T/M
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Delivery Time
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Usually within 10-45 days after receipt of advance payment
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Size Chart:
| DN | OD Outside Diameter |
ASTM A36 GR. A Round Steel Pipe | BS1387 EN10255 | ||||
| SCH10S | STD SCH40 | LIGHT | MEDIUM | HEAVY | |||
| MM | INCH | MM | (mm) | (mm) | (mm) | (mm) | (mm) |
| 15 | 1/2” | 21.3 | 2.11 | 2.77 | 2 | 2.6 | - |
| 20 | 3/4” | 26.7 | 2.11 | 2.87 | 2.3 | 2.6 | 3.2 |
| 25 | 1” | 33.4 | 2.77 | 3.38 | 2.6 | 3.2 | 4 |
| 32 | 1-1/4” | 42.2 | 2.77 | 3.56 | 2.6 | 3.2 | 4 |
| 40 | 1-1/2” | 48.3 | 2.77 | 3.68 | 2.9 | 3.2 | 4 |
| 50 | 2” | 60.3 | 2.77 | 3.91 | 2.9 | 3.6 | 4.5 |
| 65 | 2-1/2” | 73 | 3.05 | 5.16 | 3.2 | 3.6 | 4.5 |
| 80 | 3” | 88.9 | 3.05 | 5.49 | 3.2 | 4 | 5 |
| 100 | 4” | 114.3 | 3.05 | 6.02 | 3.6 | 4.5 | 5.4 |
| 125 | 5” | 141.3 | 3.4 | 6.55 | - | 5 | 5.4 |
| 150 | 6” | 168.3 | 3.4 | 7.11 | - | 5 | 5.4 |
| 200 | 8” | 219.1 | 3.76 | 8.18 | - | - | - |
ROYAL GROUP provides high-quality carbon steel round pipes and galvanized round pipes with strict quality control and customized production capabilities.
Precise Thickness Control: Pipe thickness is manufactured according to contract requirements, with tolerance controlled within ±0.01mm to ensure consistent quality and accuracy.
Smooth Cutting & Processing: Advanced laser cutting technology ensures clean, smooth, and neat pipe ends for easier installation and fabrication.
Flexible Length Options: Standard cutting lengths are available from 6 to 12 meters, with American standard lengths such as 20ft and 40ft also available. Customized lengths, including special sizes up to 13 meters or longer, can be produced according to customer requirements.
Large Production Capacity: With a 50,000 m² warehouse and daily production capacity exceeding 5,000 tons, ROYAL GROUP ensures stable supply, fast delivery, and competitive pricing.
Wide Applications: Suitable for construction, steel structures, machinery, pipelines, infrastructure projects, and industrial applications.
ROYAL GROUP is committed to providing reliable steel pipe solutions with professional service, efficient production, and global delivery capability.
Black carbon steel pipe is a steel pipe mainly composed of carbon and iron elements, offering excellent strength, durability, and versatility for various industrial applications.
High Strength & Load Capacity: Carbon steel pipes have excellent mechanical strength and hardness, allowing them to withstand high pressure, heavy loads, and demanding structural applications.
Good Toughness & Wear Resistance: With strong impact resistance and durability, black carbon steel pipes are suitable for transporting liquids, gases, and abrasive materials under different working conditions.
Reliable Performance: Carbon steel pipes provide stable performance in various environments. Although their corrosion resistance is lower than galvanized or stainless steel pipes, proper coating and surface treatment can effectively improve corrosion protection.
Excellent Processability: Easy to cut, weld, bend, and customize, carbon steel pipes can be fabricated through welding, threading, and other processing methods to meet different project requirements.
Cost-Effective Solution: Compared with other metal pipe materials, carbon steel pipes offer competitive pricing, high efficiency, and long service life.
Wide Applications: Black carbon steel pipes are widely used in oil and gas pipelines, chemical industries, machinery manufacturing, construction, shipbuilding, bridges, and infrastructure projects, especially for structural support and fluid transportation systems.
Low carbon steel pipes are widely used in construction, infrastructure, energy, and industrial fields due to their excellent weldability, strength, and cost-effectiveness. Common applications include:
1.Fluid Transportation Systems
Low carbon steel pipes are commonly used for transporting low-pressure fluids such as water, gas, air, oil, and heating steam in residential, commercial, and industrial systems.
2.Electrical Conduit & Wire Protection
Ordinary carbon steel conduit pipes are used in industrial and civil electrical installations to protect wires and cables, as well as in machinery and equipment installation projects.
3.Straight Seam Welded Steel Pipes
Straight seam welded pipes feature weld seams parallel to the pipe length and are widely used in applications such as metric welded pipes, thin-wall welded pipes, and transformer cooling oil pipes.
4.Spiral Submerged Arc Welded Pipes for Oil & Gas Transportation
Spiral welded steel pipes are manufactured from hot-rolled steel coils through spiral forming and double-sided submerged arc welding. With excellent pressure resistance, large diameters, and high transmission efficiency, they are widely used for long-distance oil and natural gas pipelines.
5.Spiral High-Frequency Welded Steel Pipes
Q235 spiral high-frequency welded pipes are suitable for pressure fluid transportation applications. Their large diameter and efficient transmission performance make them ideal for oil, gas, and industrial pipeline systems.
6.Spiral Submerged Arc Welded Pipes for Low-Pressure Fluids
These pipes are designed for general low-pressure fluid transportation, including water, gas, air, and steam systems, and are widely applied in municipal engineering, construction, and industrial projects.
With excellent mechanical properties, flexible processing options, and competitive cost, low carbon steel pipes provide reliable solutions for pipeline transportation, structural applications, and industrial engineering projects.
Note:
1. Free sampling, 100% after-sales quality assurance, Support any payment method;
2. All other specifications of round carbon steel pipes are available according to your requirement (OEM&ODM)! Factory price you will get from ROYAL GROUP.
Process of production
The production process of welded steel pipes involves multiple steps to ensure accurate dimensions, reliable weld quality, and excellent mechanical performance.
- Raw Material Preparation & Uncoiling
The production starts with high-quality steel plates or steel strip coils. The raw material is uncoiled, leveled, and prepared for further processing. - Edge Cutting & Welding Preparation
The flattened steel strip edges are trimmed and processed to ensure proper alignment before welding. - Forming & Welding
The steel strip is gradually formed into a round pipe shape through a forming process. The pipe is then welded, with both inner and outer weld beads removed to achieve a smooth surface. - Pre-Correction & Heat Treatment
The welded pipe undergoes pre-correction and induction heat treatment to improve structural stability and eliminate welding stress. - Sizing & Straightening
Advanced sizing equipment is used to achieve accurate pipe dimensions, followed by straightening to ensure proper alignment. - Inspection & Testing
Each pipe undergoes strict quality inspections, including:
- Eddy current testing
- Hydraulic pressure testing
- Dimensional inspection
- Surface quality inspection
- Surface Treatment & Final Inspection
Pipes are cleaned through pickling when required and undergo final quality checks to ensure they meet customer specifications and international standards. - Packaging & Delivery
After passing inspection, steel pipes are securely packaged and stored for shipment, ensuring safe transportation to global customers.
ROYAL GROUP applies strict quality control throughout the entire manufacturing process, providing reliable welded steel pipes with consistent performance and customized solutions for various applications.
ROYAL GROUP adopts professional packaging and transportation solutions to ensure carbon steel pipes arrive safely at the destination with excellent surface quality and structural integrity.
1. Cargo Packaging
Carbon steel products are prone to oxidation and rust when exposed to moisture and air for a long time. To protect the pipes during transportation, suitable packaging methods are applied:
1.Standard packaging: Bare bundles secured with strong steel wire or steel straps for efficient loading and unloading.
2.Customized packaging: Waterproof wrapping, rust-proof film, wooden cases, or protective materials are available according to customer requirements.
3.Proper packaging prevents surface damage, moisture exposure, and corrosion during long-distance transportation.
2. Transportation Environment Control
A suitable transportation environment is essential for maintaining steel pipe quality:
1.Avoid exposure to excessive humidity, rain, and harsh weather conditions.
2.Protect products from direct contact with corrosive materials during shipping.
3.Arrange proper loading methods to prevent collision, friction, bending, or deformation.
3. Loading & Unloading Safety
Professional handling procedures are required to prevent damage during loading and unloading:
1.Use suitable equipment such as cranes, lifting belts, and forklifts.
2.Avoid strong impacts, excessive pressure, dragging, or improper handling.
3.Follow strict safety procedures to protect both products and operators.
With reliable packaging methods, careful transportation management, and professional handling processes, ROYAL GROUP ensures safe, efficient, and damage-free delivery of carbon steel pipes to customers worldwide.
Transportation: Express (Sample Delivery), Air, Rail, Land, Sea shipping (FCL or LCL or Bulk)
Our Customer
Q1: What types of carbon steel pipes do you supply?
A: ROYAL GROUP supplies various carbon steel pipes, including seamless steel pipes, welded steel pipes, black carbon steel pipes, galvanized steel pipes, and spiral welded steel pipes with customized specifications.
Q2: What materials and grades are available for carbon steel pipes?
A: Common materials include Q235B, Q355B, ASTM A36, ASTM A53, ASTM A106, API 5L Grade B, X42, X52, and other grades according to customer requirements.
Q3: What sizes of carbon steel pipes can you provide?
A: We offer customized outer diameters, wall thicknesses, and lengths. Standard lengths are usually 6m and 12m, while special lengths can be produced according to project requirements.
Q4: Can carbon steel pipes be customized?
A: Yes. We provide customized services including cutting, welding, threading, coating, galvanizing, end processing, and special dimensions based on customer drawings or specifications.
Q5: What are the main applications of carbon steel pipes?
A: Carbon steel pipes are widely used in oil and gas transportation, water supply systems, construction, steel structures, machinery manufacturing, chemical industries, shipbuilding, and infrastructure projects.
