​13CrMo44 Structural Steel Pipe Overview​​

13CrMo44 is a ​​chromium-molybdenum (Cr-Mo) alloy steel pipe​​ designed for high-temperature and high-pressure applications, particularly in power generation, petrochemical, and boiler systems . It complies with the German standard ​​DIN 17175​​ and is widely used for its excellent mechanical strength, corrosion resistance, and thermal stability

​​Key Features and Specifications​​

1. ​​Chemical Composition​​

13CrMo44’s alloying elements enhance its high-temperature performance and corrosion resistance:

Element

Range (%)

Role

Carbon (C)

0.08–0.18

Balances strength and weldability

Chromium (Cr)

0.70–1.10

Improves oxidation and corrosion resistance

Molybdenum (Mo)

0.40–0.65

Enhances high-temperature strength and creep resistance

Manganese (Mn)

0.40–1.00

Increases hardenability and toughness

Silicon (Si)

0.10–0.35

Improves deoxidation and strength

Phosphorus (P)

≤0.035

Controlled to avoid brittleness

Sulfur (S)

≤0.035

Minimized to reduce hot cracking

2. ​​Mechanical Properties​​

Property

Value

Notes

​​Tensile Strength​​

440–590 MPa

Suitable for high-stress environments

​​Yield Strength​​

≥290 MPa (for ≤16mm thickness)

Decreases slightly with thicker sections

​​Elongation​​

≥22%

Ensures ductility under load

​​Impact Toughness​​

≥34 J (at room temperature)

Critical for low-temperature applications

3. ​​Heat Treatment and Delivery Conditions​​

​​Optional Treatments​​:

​​Quenching and Tempering​​: Improves strength and toughness for extreme conditions

​​Stress Relief​​: Applied for welded components to prevent cracking

​​Post-Weld Heat Treatment (PWHT)​​: Often required to restore mechanical properties

4. ​​Applications​​

13CrMo44 pipes are ideal for:

​​Boilers and Superheaters​​: Operates at ≤650°C and pressures ≥9.8 MPa

​​Petrochemical Plants​​: Resists sour gas and corrosive fluids .

​​Power Generation​​: Used in steam pipelines, turbines, and nuclear reactors

​​Pressure Vessels​​: Suitable for high-pressure storage tanks

5. ​​Dimensions and Tolerances​​

​​Outer Diameter​​: 17.2–168 mm

​​Wall Thickness​​: 1.8–22 mm

​​Length​​: Up to 18,000 mm

​​Tolerances​​:

OD: ±0.6% (for ≤120 mm)

Wall Thickness: ±9–12.5% (varies with OD)

6. ​​Standards and Equivalents​​

​​Primary Standard​​: DIN 17175

​​International Equivalents​​:

ASTM A213 T12

ASME SA335 P12

​​Advantages of 13CrMo44​​

​​High-Temperature Stability​​: Retains strength up to 650°C

​​Corrosion Resistance​​: Chromium content resists oxidation in harsh environments

​​Weldability​​: Preheating and PWHT ensure joint integrity

​​Cost-Efficiency​​: Balances performance and affordability for industrial use

For detailed technical specifications or custom orders, refer to suppliers’ data sheets or standards like ​​DIN 17175​​