Xi'an Dongmeng Group Co., Ltd. is one of the most reliable manufacturers and suppliers of Seamless Carbon Steel Pipe Manufacturer | ASTM A106, ASTM A53, API 5L Seamless Steel Pipe Supplier in China, also supports customized service. With abundant experience, we warmly welcome you to wholesale cheap products in stock here and get free sample from our factory. For price consultation, contact us.
What Is Seamless Carbon Steel Pipe?
Seamless Carbon Steel Pipe is manufactured from solid steel billets through rotary piercing, hot rolling, and cold drawing processes without any welded seams. The absence of welds creates a uniform structure with superior strength, pressure resistance, and reliability compared with welded pipes.
Due to its excellent mechanical properties, seamless carbon steel pipe is widely used in oil and gas transmission, refinery systems, petrochemical plants, power generation facilities, high-pressure boilers, offshore platforms, mining projects, construction engineering, and industrial fluid transportation systems.
As a professional Seamless Carbon Steel Pipe Manufacturer, Xi'an Dongmeng Group Co., Ltd supplies industrial-grade seamless steel pipes meeting ASTM, API, ASME, EN, and ISO requirements for global EPC contractors, engineering companies, distributors, and industrial end users.
Why Choose Seamless Carbon Steel Pipe?
Superior Pressure Resistance
No welded seam eliminates potential weak points under pressure.
High Temperature Performance
Suitable for steam pipelines, boilers, refineries, and power plants.
Excellent Mechanical Strength
Outstanding tensile and yield strength for demanding applications.
Uniform Metallurgical Structure
Consistent properties throughout the entire pipe wall.
Long Service Life
Reliable performance under harsh operating conditions.
Wide Industry Acceptance
Complies with global engineering standards.
How Seamless Carbon Steel Pipe Is Manufactured
Step 1 – Raw Material Inspection
Premium carbon steel billets are chemically and mechanically tested.
Step 2 – Billet Heating
Billets are heated to controlled rolling temperatures.
Step 3 – Rotary Piercing
The solid billet is pierced into a hollow shell.
Step 4 – Hot Rolling
The hollow shell is elongated into seamless pipe form.
Step 5 – Sizing & Straightening
Precise OD and wall thickness dimensions are achieved.
Step 6 – Heat Treatment
Normalizing, annealing, or stress relieving improves mechanical properties.
Step 7 – Non-Destructive Testing
UT, ET, RT, and hydrostatic testing ensure product integrity.
Step 8 – Final Inspection & Packaging
Pipes are inspected, marked, bundled, and prepared for shipment.
Products Description
1.Seamless Steel tubes ASTM A53 for general purposes: SA53B specification: wall thickness: 1/4"-28"Outer Diameter: 13,7-711.2mm
2. SEAMLESS STEEL TUBE for high temperature service: ASTM A106 ,SA106B, specification: wall thickness: 1/4"-28"Outer Diameter: 13,7-711.2mm
3.Pipe line API SPEC 5L. : SA106 SPECIFICATION: 1/4"-28", 13.7-711.2 mm
4.Seamless low carbon steel tube for heat exchange and condensers: ASTM A 179 , specification: 3/4", 1"
5. SEAMLESS STEEL TUBES ASTM AS33 for low temperature service at-40 °C-101 °C : GR 1,GR 3, 6. GR.7, specification: 1/4"-28", 13.7-711.2 mm.
6. Din 2448/1629 seamless steel tube: ST37, ST44, ST52, specification: 1/4"-28", 13.7-711.2 mm.
7.Heat resistant seamless steel tubes (heat strength tubes) DIM7175-1979: carbon Structural Steel St35.8-St45.8/, St35.8-St45.8.
8. Seamless steel tubes for structural purposes : 10 # , subtotal, 35 # , 45 #, specification, 6-720mm* 1-70 mm .
9. Seamless steel tubes for fluid conveyance: 10 # , 20 # , specification: 6-P20 * 1-70 mm
10. Low and medium pressure boiler tubes: 10 # , 20 # . Size: 6-720 * 1-70 M
11.High-pressure boiler tubes: 20#, specification: 6-720 * 1-70mm, are seamless carbon steel nominal tubes for high-temperature service. The Execution Standard ASME is identical with ASTM STANDARD A106/A106M-08.
Products Specifications
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Product Name |
Top Quality ASTM A53 A106 API 5L Seamless Carbon Steel Pipe |
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Standard |
China GB/T8162/T8163 GB5310/6479/9948, 3091-2001, GB/T 13793-1992, GB/T9711 |
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USA ASTM A53/A106/A178/A179/A192/A210/A213/A333/A335/A283/A135/A214/315/A500/A501/A519/A161/A333; API 5L/5CT, ASTM A53-2007, ASTM A671-2006, ASTM A252-1998, ASTM A450-1996, ASME B36.10M-2004, ASTM A523-1996 |
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Japan JIS G3452/G3454/G3456/G3457/G3458/G3460/3461/3462/3464 |
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German DIN 1626/17175/1629-4/2448/2391/17200 SEW680 |
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Russia GOST 8732/8731/3183 |
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British and European BS 1387, BS EN10296, BS6323, BS 6363, BS EN10219 |
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Material and Grade |
China 10#, 20#, 16Mn, 20G, 15MoG, 15CrMo, 30CrMo,42Crmo, 27SiMn, 20CrMo |
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U.S.A. Gr. B/Gr.A/A179/A192/A-1/T11/T12/T22/P1/FP1/T5/4140/4130 |
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Japan STPG38,STB30,STS38,STB33,STB42,STS49,STBA23,STPA25,STPA23 |
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German ST33,ST37,ST35,ST35.8,ST45,ST52,15Mo3,13CrMo44, 1.0309, 1.0305, 1.0405 |
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Russia 10, 20, 35, 45, 20X |
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Wall thickness |
0.5MM~80MM |
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Outer Diameter |
21.3MM~762MM |
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Length |
5m-14m or as customer's request |
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Shape |
Round,Square, Rectangular |
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Packing |
Plain end/Beveled,protected by plastic caps on both ends, cut quare,grooved,threaded and coupling,etc. |
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Surface Treatment |
1. PVC,Black and color painting
2. Galvanized |
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Product Application |
1. Fence, greenhouse, door pipe,greenhouse |
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Delivery Time |
3-30 days according to our stock and purchase quantity |
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MOQ |
3 tons, larger quantity, lower price
We can provide carbon steel tubes of various diameters and thicknesses, we can also support custom service, if you want more details, please contact us! |
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SEAMLESS TUBES FOR BOILER AND HIGH TEMPERATURE SERVICE
1. Standards
DIN 17175, EN 10216-2, ASTM A 106, ASTM A179, NF A 49-211, ASTM A210, ASTM A213, ASTM A335;
2. Used for
Construction for: boiler, pipe lines, pressure vessels, equipment for high temperature and pressure, equipment for heat-exchanger and condenser.
3. Dimensions
According EN 10216-2 or ASME B36.10M in dimensional range corresponding to the workshop CPE (Tab.1 and Tab.2) or ASSEL (Tab.3) or Cold rolling and drawing (Tab.4)
4. Tolerances
| Standard | Outside Diameter | Wall Thickness | Weight |
| ASTM A 106 NF A 49-211 |
OD≤48.3; ±0,40mm 48.3 114.3 OD>219.1; +2.4/-0.8mm |
+12.5% | +10/-3.5% for any length of pipe |
| EN 10216-2 hot rolled | ±1.0% or ±0.5mm (which is higher) | ±12.5% or ±0.4mm (which is higher) | |
| DIN 17175 hot rolled |
OD<=100 ± 0.75% (minimum±0.5mm) 100 |
OD <=130; WT≤ 2Sn; +15/-10% OD <=130; 2Sn OD <=130; WT>4Sn; ±9% 130 130 1300.11OD; ±10% Sn- Nominal wall thickness according to DIN 2448 |
+10/-8% for each tube ±7.5% for a lots over 10t |
| ASTM A210 hot rolled |
OD<=101.6+0.4/-0.8mm 101.6 190.50 |
OD<=101.6 and WT<=2.4; +40%/0 OD<=101.6 and 2.4 OD<=101.6 and 3.8 OD<=101.6 and WT>4.6; +28%/0 OD>101.6 and 2.4 OD>101.6 and 3.8 101.6 and WT>4.6; +28%/0 |
+16%/0 |
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ASTM A213 hot rolled |
OD≤100mm: +0.4mm / -0.8 mm 100 200 |
Average wall thickness: 10.3 WT<73 mm & (WT/OD)≤5%: +22.5%/-12.5% WT<73 mm & (WT/OD)>5%: +15%/-12.5%
Minim wall thickness: WT ≤ 2.4 mm (only for OD ≤ 114.3 mm): + 40 % / -0% 2.4 3.8 WT>4.6 mm: +28% / -0%
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ASTM A213 Cold finished |
OD ≤25: +0.10 mm/-0.11 mm 25 40 50≤OD < 65mm: ±0.25 mm 65≤OD < 75 mm: ±0.30 mm 75≤OD ≤100 mm: ±0.38 mm 100 200
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Average wall thickness: ±10%
Minim wall thickness: For OD ≤38.1mm => WT = +20% / -0 For OD >38.1mm => WT= +22% / -0 |
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ASTM A335 hot rolled |
For pipe ordered to NPS [DN] or outside diameter: 10.3 48.3 114.3 219.1 For pipe ordered to inside diameter: ±1% |
10.3 WT<73 mm & (WT/OD)≤5%: +22.5%/-12.5% WT<73 mm & (WT/OD)>5%: +15%/-12.5%
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| DIN 17175 cold rolled |
OD<=120± 0.6%(minimum±0.25mm) OD>120±0.75%
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OD <=130; WT≤ 2Sn; +15/-10% OD <=130; 2Sn OD <=130; WT>4Sn; ±9% 130 130 1300.11OD; ±10% Sn – Nominal wall thickness according to DIN 2448 |
+10/-8% for each tube ±7.5% for a lots over 10t |
| EN 10216-2 cold rolled | ±0.5% or ±0.3mm (which is higher) | ±10% or ±0.2 mm (which is higher) | |
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ASTM A179 and ASTM A210 cold rolled |
OD<25.4; ±0.10 25.4<=OD<=38.1; ±0.15 38.1 50.8>=OD<63.5; ±0.25 63.5>=OD<76.2; ±0.30 |
OD<=38.1; +20% OD>38.1; +22% | OD<=38.1; +12% OD>38; +13% |
5. Chemical Composition (%)
| Steel Group | C | Si | Mn | P max | S max | Cr | Mo | Ni | Sn |
| Grade A, TU E275 | max 0.25 | min 0.10 | 0.27÷0.93 | 0.035 | 0.035 | ||||
| Grade B | max 0.30 | min 0.10 | 0.29÷1.06 | 0.035 | 0.035 | ||||
| St35.8, TU E220 | max 0.17 | 0.10÷0.35 | 0.40÷0.80 | 0.040 | 0.040 | ||||
| St45.8, TU E250 | max 0.21 | 0.10÷0.35 | 0.40÷1.20 | 0.040 | 0.040 | ||||
| P195GH | max.0.13 | max.0.35 | max.0.70 | 0.025 | 0.020 | max 0.30 | max 0.08 | max 0.30 | |
| P235GH | max.0.16 | max.0.35 | max.1.20 | 0.025 | 0.020 | max 0.30 | max 0.08 | max 0.30 | |
| P265GH | max.0.20 | max0.40 | max.1.40 | 0.025 | 0.020 | max 0.30 | max 0.08 | max 0.30 | |
| 16Mo3 | 0.12÷0.20 | max0.35 | 0.40÷0.90 | 0.025 | 0.020 | max 0.30 | 0.25÷0.35 | max.0.30 | |
| 13CrMo4-5 | 0.10÷0.17 | max0.35 | 0.40÷0.70 | 0.025 | 0.020 | 0.70 ÷1.15 | 0.40÷0.60 | max.0.30 | |
| 10CrMo9-10 | 0.08-0.14 | max 0.50 | 0.30÷0.70 | 0.020 | 0.010 | 2.0 ÷2.50 | 0.90÷1.10 | max.0.30 | |
| ASTM A179 | 0.06÷0.18 | – | 0.27÷0.63 | 0.035 | 0.035 | ||||
| Grade A-1 | max0.27 | min. 0.10 | max. 0.93 | 0.035 | 0.035 | ||||
| T11 | 0.05-0.15 | 0.30-0.60 | 0.30-0.60 | 0.025 | 0.025 | 1.00-1.50 | 0.44-0.65 | ||
| T22 | 0.05-0.15 | 0.30-0.60 | 0.30-0.60 | 0.025 | 0.025 | 1.90-2.60 | 0.87-1.13 | ||
| P5 | max. 0.15 | max. 0.50 | 0.30-0.60 | max. 0.025 | 0.025 | 4.00-6.00 | 0.45-0.65 | ||
| P11 | 0.05-0.15 | 0.50-1.00 | 0.30-0.60 | max. 0.025 | max. 0.025 | 1.00-1.50 | 0.44-0.65 | ||
| P22 | 0.05-0.15 | max. 0.50 | 0.30-0.60 | max. 0.025 | max. 0.025 | 1.90-2.60 | 0.87-1.13 |
6. Mechanical Properties
| Steel Group | Yield Strength, min. | Tensile Strength | Elongation | Impact | |
| N/mm² | N/mm² | min. (%) | J | (°C) | |
| Grade A, TU E275 | 205 | min. 330 | Calculation acc. to | ||
| Grade B | 240 | min 415 | the wall thickness | ||
| St35.8, TU E220 | 235 | 360÷480 | 25 | ||
| St45.8, TU E250 | 255 | 410÷530 | 21 | ||
| P195GH | 195 | 320÷440 | 27 | 28 | -10 |
| P235GH | 225 | 360÷500 | 25 | 28 | -10 |
| P265GH | 255 | 410÷570 | 23 | 28 | -10 |
| 16Mo3 | 270 | 450÷600 | 22 | 40 | 20 |
| 13CrMo4-5 | 290 | 440÷590 | 22 | 40 | 20 |
| 10CrMo9-10 | 280 | 480÷630 | 22 | 40 | 20 |
| ASTM A179 | 180 | 325 | 36 | HRB = max 72 | |
| Grade A-1 | 255 | 415 | 30 | HRB = max 79 | |
| T11 | 205 | 415 | 30 | 85HRB/250HBW/170HV | |
| T22 | 205 | 415 | 30 | 85HRB/250HBW/170HV | |
| P5 | 205 | 415 | 30 | ||
| P11 | 205 | 415 | 30 | – | |
| P22 | 205 | 415 | 30 | – | |
7. Lengths
Random lengths or fixed lengths in length range correspond-ing to the -workshop CPE (Tab.1 and Tab.2) or ASSEL (Tab.3) or Cold rolling and drawing (Tab.4).
8. Protection
Unprotected;
External varnished with black or clear lacquer;
If required, the tubes can be delivered with plastic caps at both ends.
9. Marking
According to standard or per customer request.
10. Delivery
Bundles up to:
2000 kg (4400 lbs) – cold drawn tubes;
4000 kg (8800 lbs) – hot rolled tubes.
Quantity tolerances: ±5% per size or / and per total.
The bundles will have one tag applied at each end, marked according to standard or at customer's request.
11. Mill test report
Mill test reports are issued to customer requirements. Usually they comply with DIN 50049, EN 10204.
12. Quality certified
TUV-PED,.AD.SGS.ISO9001
ASTM A53 vs ASTM A106 vs API 5L
| Item | ASTM A53 | ASTM A106 | API 5L |
|---|---|---|---|
| Main Application | General Service | High Temperature Service | Oil & Gas Pipeline |
| Pressure Resistance | Good | Excellent | Excellent |
| Temperature Resistance | Moderate | Excellent | Good |
| Boiler Service | No | Yes | No |
| Refinery Service | Limited | Excellent | Good |
| Pipeline Transmission | Good | Good | Excellent |
| Cost | Lower | Medium | Higher |
Pressure Service Applications
| Application | Recommended Standard |
|---|---|
| Steam Pipelines | ASTM A106 |
| High Temperature Systems | ASTM A106 |
| Refinery Units | ASTM A106 |
| Water Transmission | ASTM A53 |
| Structural Projects | ASTM A53 |
| Oil Pipelines | API 5L |
| Natural Gas Pipelines | API 5L |
| Offshore Projects | API 5L |
Why Choose Xi'an Dongmeng Group Co., Ltd
20+ Years Manufacturing Experience
ASTM / API / EN Standard Production
Full Size Inventory Availability
Fast Production & Delivery
OEM & ODM Processing Support
EN10204 3.1 Certification
Third-Party Inspection Support
Competitive Factory Direct Pricing
Professional Export Team
Global EPC Project Experience
Request A Quick Quote
To receive an accurate quotation, please provide:
Standard (ASTM A106 / ASTM A53 / API 5L)
Grade
Outside Diameter (OD)
Wall Thickness (WT)
Length
Quantity
Destination Port
Inspection Requirements
Our engineering sales team typically responds within 6 hours.
Get Factory Direct Pricing For Seamless Carbon Steel Pipes Today
Contact our engineering team for technical consultation, material recommendations, project support, and competitive quotations.
Our address
Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province
Phone Number
+86 15769214734
FAQ
What is the difference between seamless and welded pipe?
Seamless pipes have no weld seam and generally offer higher pressure resistance and reliability than welded pipes.
Which pipe is best for high-temperature service?
ASTM A106 Grade B or Grade C is the preferred choice.
What is Schedule 40 pipe?
Schedule 40 refers to a standard wall thickness classification widely used in industrial piping systems.
What is Schedule 80 pipe?
Schedule 80 has a thicker wall than Schedule 40 and is suitable for higher-pressure applications.
Can seamless pipe be used for oil and gas transportation?
Yes. API 5L seamless pipe is specifically designed for oil and gas transmission.
Can you provide EN10204 3.1 certificates?
Yes, material test certificates are available.
Do you accept third-party inspections?
Yes. SGS, BV, TUV, DNV and customer-appointed inspectors are welcome.
What coatings are available?
Black painting, varnish coating, anti-rust oil, 3PE, FBE, and galvanized coatings.
What is your MOQ?
Generally 1 ton, depending on specifications.
Can you provide custom lengths and cutting?
Yes. OEM cutting, beveling, threading, grooving, and fabrication services are available.
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