13CrMo4-5 Alloy Steel Pipe

In industrial pipeline systems, alloy steel pipes have become a key material for working environments such as high temperature and high pressure due to their excellent comprehensive performance. 13CrMo4-5 alloy steel pipe, as one of the outstanding products, is widely used in important industries such as petrochemicals, power, boilers, etc. due to its excellent heat resistance, toughness, and corrosion resistance.

What Material is 13CrMo4-5?

13CrMo4-5 is a low-alloy heat-resistant steel material, which belongs to the important steel grades in the European standard EN 10216-2 (seamless steel pipe) and EN 10217 (straight seam steel pipe) systems. Its chemical composition is based on iron, with key alloying elements including 0.80% -1.25% chromium (Cr) and 0.4% -0.6% molybdenum (Mo), as well as small amounts of carbon (C 0.10-0.17%), silicon (Si ≤ 0.35%), manganese (Mn 0.40% -0.70%), and other elements.

These alloying elements play an indispensable role in 13CrMo4-5 alloy steel pipes. Chromium element can react rapidly with oxygen at high temperatures, forming a dense and stable oxide film on the surface of steel. This oxide film acts as a strong armor, effectively isolating corrosive media from the outside world and significantly improving the resistance of steel pipes to high temperature oxidation and corrosion.

Molybdenum element penetrates deep into the interior of steel and enhances its lattice structure through solid solution strengthening mechanism, thereby improving high-temperature strength; It can also refine the grain structure of steel, improve material toughness, and delay the tissue aging process at high temperatures.

In practical applications, the synergistic effect of the two enables 13CrMo4-5 alloy steel pipes to have excellent high-temperature service performance, especially suitable for high temperature conditions of 400-550 ℃. Within this temperature range, the alloy steel pipe not only maintains good mechanical properties, but also effectively resists the erosion of media such as steam and high-temperature gases, ensuring long-term stable operation of the equipment.

Material Properties of 13CrMo4-5 Alloy Steel Pipe

Material performance

Excellent high-temperature strength: At a working temperature of around 450 ℃, its yield strength can still remain above 240MPa, and its tensile strength can reach above 440MPa. It can effectively withstand the pressure of the medium inside the pipeline and avoid plastic deformation at high temperatures.

Good heat fatigue resistance: Faced with periodic temperature fluctuations in working conditions, 13CrMo4-5 alloy steel pipes are not easily cracked due to thermal stress, and have strong long-term stability, especially suitable for boiler heating surface pipelines, steam pipelines and other scenarios.

Outstanding corrosion resistance: The oxide film formed by chromium element can resist the erosion of high-temperature flue gas, steam and some corrosive media, reduce the corrosion and wear of the inner wall of the pipeline, and extend the service life.

Good welding performance: Through reasonable welding processes (such as preheating to 150-250 ℃ and slow cooling after welding), welding cracks can be effectively avoided, and the performance of the welded joint matches the base material well, meeting the process requirements for pipeline installation.

Advantages of 13CrMo4-5 Alloy Steel Pipe

Suitable for harsh working conditions

High cost-effectiveness

Strong processing convenience

Significant Features

Good Organizational Stability

Reliable Low-Temperature Toughness

Introduction to Specifications of Alloy Steel Pipe

The specifications of 13CrMo4-5 alloy steel pipes cover a wide range and can be customized according to the needs of different industries. The common specification parameters are as follows:

Outer diameter (OD): The outer diameter of seamless steel pipes is usually 10.2mm to 711mm, which can meet the needs of different scenarios such as small diameter instrument pipes, medium diameter steam pipes, and large diameter oil pipelines.

Wall thickness (WT): The wall thickness range is 1.6mm to 100mm, with commonly used industrial wall thicknesses ranging from 3mm to 20mm. Thick walled pipes (≥ 20mm) are suitable for high-pressure pipelines (such as power plant main steam pipelines), while thin-walled pipes are mostly used for low-pressure and high-temperature medium transport pipelines.

Length: The conventional fixed length is 6m-12m, but customized or special lengths (such as 18m) can be provided according to customer needs to reduce the number of welding joints during installation.

Delivery status: Usually delivered in a "normalized+tempered" (N+T) state; Partial scenarios can also provide annealing (A) or hot rolling (HR) states to meet different processing requirements.

13CrMo4-5 Similar Material

13CrMo4-5 alloy steel pipe, as a European standard alloy material, has equivalent or similar materials in different countries' standard systems, which facilitates cross standard material selection for enterprises

The Difference Between 13CrMo4-5 and ASTM A335 P12

ASTM A335 P12 is a low-alloy heat-resistant steel pipe in the American standard, often compared with 13CrMo4-5. Although both belong to chromium molybdenum alloy pipes, there are significant differences in composition, performance, and application scenarios:

Chemical Composition Differences

As shown in the table, the carbon, manganese, and silicon content of 13CrMo4-5 is slightly higher than that of ASTM A335 P12, which directly affects the strength and heat resistance of both.

Differences in Mechanical Properties

High temperature strength: At 450 ℃, the yield strength of 13CrMo4-5 is ≥ 290MPa, and the yield strength of ASTM A335 P12 is ≥ 205MPa. 13CrMo4-5 has stronger high-temperature bearing capacity and is more suitable for high-pressure and high-temperature conditions.

Impact toughness: At room temperature, the impact energy of 13CrMo4-5 is ≥ 40J, and ASTM A335 P12 is ≥ 34J. 13CrMo4-5 has better impact resistance and is safer under low temperature or vibration conditions.

Heat resistance temperature: The upper limit of long-term use temperature for 13CrMo4-5 is about 550 ℃, while ASTM A335 P12 is about 530 ℃. The former has better stability in higher temperature environments.

Differences in Application Scenarios

13CrMo4-5: Due to its superior strength and heat resistance, it is commonly used in the superheater and reheater tubes of high-pressure power plant boilers, as well as in the feed tubes of high-temperature and high-pressure reactors and catalytic cracking unit pipelines in the petrochemical industry.

ASTM A335 P12: More suitable for medium, low pressure, and high temperature conditions, such as steam pipelines and heat medium transport pipelines in oil refineries, as well as low-temperature heating surface pipelines in small power plants.

13CrMo4-5 alloy steel pipe has become an ideal choice for high-temperature and high-pressure pipelines in the industrial field due to its excellent high-temperature performance, reliable stability, and high cost-effectiveness. Whether it is the medium transportation in the petrochemical industry or the energy transmission in the power industry, it can ensure the safe operation of the system with excellent performance. When selecting materials, enterprises can make the correct choice based on the operating temperature, pressure, and cost budget, combined with the differences between them and materials such as ASTM A335 P12 and 12Cr1MoVG.