Welcome to ALLLAND Steel Pipe Co., Ltd.
Welcome to ALLLAND Steel Pipe Co., Ltd.
ALLLAND Steel Pipe Supply
Welcome to ALLLAND Steel Pipe Manufacturing.ALLLAND supplies Grade 20 (Сталь 20) carbon steel welded pipes conforming to GOST 10704-91 standard. Manufactured from high-quality low-carbon steel, these pipes offer excellent weldability, plasticity, and stable mechanical properties. Products are available in ERW straight seam welded pipes, large-diameter pipes, and custom sizes, and support 3PE and FBE anti-corrosion treatments. They are widely used in oil and gas, water supply, heating, industrial pipelines, and structural engineering projects in Russia and the CIS market.With over 25 years of experience in steel pipe manufacturing, ALLLAND is committed to providing global customers with high-quality steel pipe solutions that meet GOST standards.
Alllandsteel is a steel pipe manufacturer based in China with 25 years of experience.
The facility spans 22,000 square meters, represents a RMB 700 million investment, and operates four production lines (JCOE, ERW, SMLS, SSAW) alongside five coating lines.
With an annual production capacity of 250,000 tons, the factory covers specifications ranging from Ø406 to Ø1524 and holds multiple international certifications (API/ASTM/EN/ISO/JIS). Focused on steel pipes, creating value for you!
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GOST 10704 Grade 20 Steel Pipe is an electrically welded straight-seam steel pipe manufactured according to the Russian standard GOST 10704-91, using Russian Steel Grade 20 (Сталь 20 / 20# Carbon Steel) as raw material.
Russian Name: Трубы стальные электросварные прямошовные. Сортамент
GOST 10704-91 mainly specifies the size range, outer diameter, wall thickness, and specification series of the steel pipe, while the technical requirements of the steel pipe are usually implemented in conjunction with GOST 10705 / GOST 10706. Grade 20 steel is derived from GOST 1050 and belongs to low-carbon high-quality structural steel.
O.D.:
10–1420 mm
W.T.:
0.8–50 mm
Length:
5-12 m, available in fixed or multiple lengths; custom lengths per project requirements.
Pipe Type:
ERW / LSAW
Standards:
GOST 1050 / GOST 10705 / GOST 10706
Material Grade:
Steel 20 (Сталь 20)
Tube Ends& Surface Treatment:
Square, Chamfered; Black Skin, Pickled, Painted/Oiled for Rust Prevention
Delivery Conditions:
Grade, Specification, Furnace Number, Standard
Grade 20 carbon steel has low carbon content, reducing welding cracking risk.
Provides sufficient strength for general industrial applications.
Compared with alloy steel pipes, Grade 20 offers economical performance.
Commonly used in Russia, Kazakhstan, Uzbekistan, and CIS markets.
GOST 10704-91 specifies the size series for electrically welded straight-seam steel pipes, with Grade 20 indicating the steel grade (Сталь 20). Actual products are usually labeled as:
GOST 10704-91 / GOST 10705 Grade 20 ERW Steel Pipe. The size range covers an outer diameter of approximately 10–1420 mm and a wall thickness of 0.8–50 mm. Specific size combinations should follow GOST 10704 Table 1.
The following is a table of commonly used specifications for the export market:
| OD (mm) | Wall Thickness (mm) | Weight (kg/m) |
| 10 | 1.0 | 0.222 |
| 12 | 1.0–2.0 | 0.271–0.493 |
| 16 | 1.0–2.0 | 0.370–0.716 |
| 20 | 1.0–2.5 | 0.469–1.11 |
| 25 | 1.0–3.0 | 0.592–1.63 |
| 32 | 1.0–3.5 | 0.765–2.46 |
| 38 | 1.2–3.5 | 1.08–2.93 |
| 42 | 1.2–4.0 | 1.20–3.72 |
| 48 | 1.2–4.0 | 1.38–3.84 |
| 57 | 1.4–5.0 | 1.90–5.48 |
| 60 | 1.5–5.0 | 2.15–5.70 |
| 76 | 1.5–6.0 | 2.75–8.51 |
| 89 | 2.0–6.0 | 4.32–12.00 |
| 102 | 2.0–6.0 | 4.97–13.20 |
| 108 | 2.0–8.0 | 5.27–20.10 |
| 114 | 2.0–8.0 | 5.57–21.30 |
| 133 | 2.5–8.0 | 8.02–24.00 |
| 140 | 2.5–8.0 | 8.45–25.20 |
| 152 | 2.5–10.0 | 9.20–35.00 |
| 159 | 3.0–10.0 | 11.70–36.60 |
| 168 | 3.0–10.0 | 12.40–38.80 |
| 219 | 3.0–12.0 | 15.90–62.00 |
| 273 | 4.0–12.0 | 26.60–78.00 |
| 325 | 4.0–16.0 | 31.60–124.00 |
| 377 | 5.0–16.0 | 45.90–145.00 |
| 426 | 5.0–18.0 | 51.60–182.00 |
| 530 | 6.0–20.0 | 76.30–256.00 |
| 630 | 6.0–22.0 | 94.00–335.00 |
| 720 | 8.0–25.0 | 140.00–430.00 |
| 820 | 8.0–25.0 | 160.00–490.00 |
| 920 | 10.0–25.0 | 225.00–560.00 |
| 1020 | 10.0–32.0 | 250.00–790.00 |
| 1220 | 12.0–32.0 | 355.00–950.00 |
| 1420 | 12.0–32.0 | 420.00–1050.00 |
Material Grade 20 Introduction
Steel Grade 20 (Сталь 20) is a commonly used low-carbon, high-quality structural steel in Russia, equivalent to:
| Standard | Equivalent Grade |
| GOST | Сталь 20 |
| China | 20# Steel |
| EN | C22 / 1.0402 |
| ASTM | AISI 1020 (Approx.) |
| Outside Diameter (OD), mm | Normal Accuracy | Increased Accuracy |
| 10 | ±0.20 mm | — |
| >10–30 | ±0.30 mm | ±0.25 mm |
| >30–51 | ±0.40 mm | ±0.35 mm |
| >51–193.7 | ±0.8% | ±0.7% |
| >193.7–426 | ±0.75% | ±0.65% |
| >426–1020 | ±0.70% | ±0.65% |
| >1020 | ±0.60% | ±6.0 mm |
GOST 10704 Grade 20 steel pipe wall thickness deviation:
| Pipe Diameter | Wall Thickness Tolerance |
| OD ≤152 mm | ±10% |
| OD >152 mm | According to GOST 19903 requirements |
GOST 10704 standard lengths are divided into:
Fixed length tolerance:
| Length | Accuracy Class I | Accuracy Class II |
| ≤6 m | +10 mm | +50 mm |
| >6 m | +15 mm | +70 mm |
Multiple length:
| Accuracy Class | Maximum Deviation |
| Class I | +15 mm |
| Class II | +100 mm |
GOST 10705 has requirements for the straightness of welded pipes:
Straightness deviation ≤1.5 mm / meter
For GOST 10705 tubes:
Ovality Not exceed OD tolerance.
For large-diameter pipes (typically ≥478 mm), depending on the accuracy class:
| Class 1 | ≤1% OD |
| Class 2 | ≤1.5% OD |
| Class 3 | ≤2% OD |
Typical chemical composition
| Element | Content (%) |
| Carbon (C) | ≤0.20 |
| Silicon (Si) | 0.17–0.37 |
| Manganese (Mn) | 0.35–0.65 |
| Phosphorus (P) | ≤0.035 |
| Sulfur (S) | ≤0.035 |
Typical performance:
| Property | Value |
| Yield Strength | ≥245 MPa |
| Tensile Strength | 410–540 MPa |
| Elongation | ≥24% |
| Hardness | Approx. 120–170 HB |
Characteristics of Grade 20: ✅ Moderate strength ✅ High elongation ✅ Good cold working properties ✅ Excellent weldability
GOST 10704 Grade 20 Steel Pipe is a straight-seam welded steel pipe manufactured using Grade 20 steel (Сталь 20 / 20# Carbon Steel). It possesses good weldability, high plasticity, stable mechanical properties, and economic efficiency.
Since Grade 20 is a low-carbon, high-quality structural steel, it is primarily used in general industrial transportation, machinery manufacturing, building structures, and low-to-medium pressure piping systems.
Grade 20 steel possesses good toughness and weldability, making it suitable for oil and gas transportation systems in non-extreme pressure environments.
Compared to API 5L pipeline steel:
ALLLAND has supplied welded and coated steel pipes for international oil and gas projects, including projects in Kazakhstan, Turkmenistan, Venezuela, and Australia, demonstrating experience in large-scale pipeline supply and international project delivery.
In cold regions such as Russia, Kazakhstan, and Uzbekistan, GOST 10704 steel pipes are widely used for:
* District heating pipelines
* Underground water transmission
Commonly used with:
GOST 10704 Grade 20 is suitable for fabricated structures and auxiliary piping requiring:
ALLLAND has supplied steel pipes for renewable energy-related projects, including a wind power project in Vietnam using structural steel pipe solutions.
For high-temperature, high-pressure steam/pressure vessel bodies, the following standards are typically used:
GOST 10704 Grade 20 Steel Pipe is a longitudinally welded steel pipe manufactured according to Russian standard GOST 10704-91 using Grade 20 carbon steel (Сталь 20). It is mainly used for industrial pipelines, structures, and mechanical applications.
GOST 10704 mainly defines:
GOST 10705 specifies:
A typical designation is:
GOST 10704-91 / GOST 10705 Grade 20 Steel Pipe
No. Although both are carbon steels, they are designed for different applications.
| Grade | Main Application |
| Grade 20 | General industrial and structural applications |
| ASTM A106 Grade B | High-temperature pressure piping |
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