GOST 550-75 15X5M Pipe | 15Х5М Seamless Alloy Steel Pipe | ASTM A335 P5 Equivalent
GOST 550-75 15X5M seamless pipe is a chromium-molybdenum low alloy steel pipe developed for petroleum refining, petrochemical processing, and high-temperature service applications.
Known in Russian standards as 15Х5М (15Kh5M), this alloy steel pipe contains approximately 5% chromium and 0.5% molybdenum, providing excellent oxidation resistance, high-temperature strength, and long-term stability under elevated operating temperatures.
15X5M alloy steel pipes are widely used in:
- Oil refineries
- Petrochemical plants
- Catalytic cracking units
- Hydrogen processing units
- High-temperature process piping
- Heat exchangers
- Furnace tubes
We are a professional supplier and exporter of:
- GOST 550-75 15X5M Pipe
- 15Х5М Seamless Pipe
- 15Cr5Mo Alloy Steel Pipe
- ASTM A335 P5 Equivalent Pipe
- 5Cr-0.5Mo Seamless Pipe
- Refinery Process Steel Tubes
from China.
What is GOST 550-75?
GOST 550-75 is the Russian standard covering:
Seamless steel tubes for petroleum processing and petrochemical industries.
The standard specifies:
- Hot-finished seamless pipes
- Cold-drawn seamless pipes
- Warm-worked seamless pipes
used in:
- Refinery units
- Petrochemical facilities
- High-temperature process systems
Pipes are supplied in Group A and Group B according to manufacturing and inspection requirements.
What is 15X5M Steel?
15Х5М (15Kh5M) is a low-alloy chromium-molybdenum steel designed for elevated temperature service.
The alloy contains:
- Chromium: 4.5–6.0%
- Molybdenum: 0.45–0.60%
which provide:
- High temperature oxidation resistance
- Good creep resistance
- Sulfidation resistance
- Long service life in refinery environments
15Х5М is commonly considered the Russian equivalent of:
- ASTM A335 P5
- ASTM A213 T5
- DIN 1.7362
- X12CrMo5
- 5Cr-0.5Mo Steel
GOST 550-75 15X5M Pipe Specification
| Item | Description |
|---|---|
| Standard | GOST 550-75 |
| Material | 15Х5М (15Kh5M) |
| Equivalent Grade | ASTM A335 P5 |
| Product Type | Seamless Pipe |
| Manufacturing Method | Hot Finished / Cold Drawn |
| Pipe Form | Round Seamless |
| Ends | Plain End / Bevel End |
| Length | 4m – 12m |
| Inspection | EN10204 3.1 |
Equivalent Grades of 15X5M
| Standard | Grade |
|---|---|
| GOST | 15Х5М |
| ASTM | A335 P5 |
| ASTM | A213 T5 |
| DIN/WNr | 1.7362 |
| DIN | X12CrMo5 |
| EN | 5CrMo16 |
| JIS | STPA25 |
| JIS | STBA25 |
| GB/T | 12Cr5Mo |
| UNS | K41545 |
Chemical Composition of 15X5M Steel
| Element | % |
|---|---|
| Carbon (C) | ≤0.15 |
| Silicon (Si) | ≤0.50 |
| Manganese (Mn) | ≤0.50 |
| Nickel (Ni) | ≤0.60 |
| Sulfur (S) | ≤0.025 |
| Phosphorus (P) | ≤0.030 |
| Chromium (Cr) | 4.5–6.0 |
| Molybdenum (Mo) | 0.45–0.60 |
| Copper (Cu) | ≤0.20 |
| Titanium (Ti) | ≤0.03 |
| Vanadium (V) | ≤0.05 |
The high chromium content significantly improves oxidation and corrosion resistance at elevated temperatures.
Mechanical Properties of GOST 550-75 15X5M Pipe
| Property | Value |
|---|---|
| Tensile Strength | ≥392 MPa |
| Yield Strength | ≥216 MPa |
| Elongation | ≥22% |
| Reduction of Area | ≥50% |
| Impact Toughness (KCU) | ≥1180 kJ/m² |
| Hardness | ≤170 HB |
These properties provide excellent performance under thermal cycling and refinery operating conditions.
Heat Treatment
15X5M pipes are typically supplied in the annealed condition.
Annealing Parameters
| Treatment | Temperature |
|---|---|
| Annealing | 840–870°C |
| Cooling | Furnace Cooling / Air Cooling |
Heat treatment improves:
- Microstructure stability
- Weldability
- High-temperature strength
- Service life
High Temperature Performance
15Х5М alloy steel is specifically designed for:
- 400°C – 650°C service
- Refinery furnace piping
- Hydroprocessing units
- Catalytic reformers
The chromium and molybdenum combination provides:
- Oxidation resistance
- Sulfidation resistance
- Hydrogen attack resistance
- Creep resistance
Weldability
15Х5М is considered:
Conditionally Weldable
Recommended procedures include:
- Preheating before welding
- Controlled welding parameters
- Post Weld Heat Treatment (PWHT)
This helps prevent:
- Cold cracking
- Heat-affected zone embrittlement
Inspection and Testing
All GOST 550-75 15X5M pipes can be supplied with:
- Chemical analysis
- Mechanical testing
- Hardness testing
- Hydrostatic testing
- Ultrasonic Testing (UT)
- Eddy Current Testing (ET)
- PMI Testing
- Dimensional inspection
Certificates:
- EN 10204 3.1
- Third-party inspection available
Applications of GOST 550-75 15X5M Pipe
Petroleum Refining
Used in:
- Crude distillation units
- Catalytic cracking units
- Hydrocrackers
Petrochemical Plants
Suitable for:
- Process piping
- High-temperature reactors
- Furnace systems
Heat Exchangers
Used for:
- High-temperature heat transfer systems
- Process heaters
Power Generation
Applied in:
- Steam lines
- Superheater systems
ASTM A335 P5 vs 15X5M
| Property | 15X5M | ASTM A335 P5 |
|---|---|---|
| Chromium | 4.5–6.0% | 4–6% |
| Molybdenum | 0.45–0.60% | 0.45–0.65% |
| Service Temperature | Up to 650°C | Up to 650°C |
| Refinery Service | Excellent | Excellent |
| Equivalent | Yes | Yes |
15Х5М is widely accepted as the Russian equivalent of ASTM A335 P5 for refinery applications.
Example Ordering Information
Product: Seamless Alloy Steel Pipe
Standard: GOST 550-75
Material: 15Х5М (15X5M)
Equivalent Grade: ASTM A335 P5
Size: 6 Inch
Wall Thickness: SCH STD
Length: 6000 mm
Ends: Beveled Ends (BE)
Certificate: EN10204 3.1
Quantity: As Required
Frequently Asked Questions
What is 15X5M pipe equivalent to?
15Х5М is generally considered equivalent to ASTM A335 P5 and ASTM A213 T5 chromium-molybdenum alloy steel.
What is GOST 550-75?
GOST 550-75 is the Russian standard for seamless steel tubes used in petroleum refining and petrochemical industries.
What is the operating temperature of 15X5M steel?
Typically up to 650°C for long-term service.
Is 15X5M suitable for refinery applications?
Yes. It is specifically developed for refinery and petrochemical processing units.
Can 15X5M pipe be supplied with EN10204 3.1 certificates?
Yes. EN10204 3.1 and third-party inspection reports are available.
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