Forged Pipe Moulds for Centrifugal Casting of Ductile Iron Pipes

Vulcan Metal's tailored product range includes forged pipe moulds engineered as high-stability thermal tools for centrifugal casting of ductile iron pipes. These forged moulds are closely aligned with Vulcan Metal’s expertise in forged rolls; clean steelmaking, controlled forging, and precision heat treatment. In forged pipe moulds, however, thermal fatigue resistance rather than wear defines performance.

The product range covers a wide diameter spectrum and includes T-type water-cooled moulds, S/N thermal tube moulds, and K-type large-diameter moulds.

The production is based on low-alloy Cr-Mo steels such as 21CrMo10, 15Cr2Mo, and 30CrMo, with strict control of steel cleanliness, forging integrity, and heat-treatment. The objective is to achieve consistent geometry, controlled heat flow, and reliable resistance to cyclic thermal stress, ensuring stable operation and repeatable pipe quality.

Types of Pipe Moulds for Centrifugal Casting (T, S, N, K)

Mould Type T-type S-type N-type K-type
Main Use Standard ductile iron pipe production Flexible or older casting lines Special machine configurations Large-diameter pipes
Typical Diameter Range DN80 - DN1200 DN150 - DN600 DN150 - DN600 DN800 - DN1200
Cooling Method Water-cooled Thermal Thermal Water / Hybrid
Thermal Gradient Level High Moderate Moderate High
Heat Transfer Behavior Very high heat extraction, controlled cooling Slower, more uniform heat transfer Slower, more uniform heat transfer High thermal mass, slower response
Main Advantage Best thermal control, stable solidification Flexible, lower stress concentration Machine-specific adaptability Structural stability for large diameters
Main Limitation Higher thermal stress Less cooling control Local stress at ends High thermal inertia
Structural Characteristics Bell-end geometry, long body, tapered bore Straight transition bore, simpler structure Similar to S-type, different end / interface geometry Heavy wall, large outer diameter, rigid structure
Typical Failure Mode Bore thermal fatigue cracking Gradual distortion, ovality End-zone cracking Structural cracking, internal stress
T-Type Water-Cooled Pipe Mould for Centrifugal Casting

T-type Water-Cooled Forged Pipe Mould

S-Type Thermal Pipe Mould for Centrifugal Casting

S-type Thermal Tube Forged Pipe Mould

N-Type Thermal Pipe Mould for Centrifugal Casting

N-type Thermal Tube Forged Pipe Mould

K-Type Large-Diameter Pipe Mould for Centrifugal Casting

K-type Large Forged Pipe Mould

Pipe Mould Materials and Grades (15Cr2Mo, 21CrMo10, 30CrMo)

Grade 15Cr2Mo 21CrMo10 30CrMo
Main Advantage High strength and toughness Thermal fatigue resistance Low-cost
Cr-Mo Level Higher alloy High Lower alloy
C (%) 0.12 - 0.18 0.16 - 0.23
 0.23 - 0.30
Si (%) 0.17 - 0.37 0.20 - 0.40 0.17 - 0.37
Mn (%) 0.40 - 0.70 0.20 - 0.40 0.40 - 0.70
Cr (%) 2.30 - 2.60 2.20 - 2.60 0.80 - 1.10
Mo (%) 0.40 - 0.55 0.30 - 0.50 0.15 - 0.25
Ni (%) ≤ 0.35 ≤ 0.50 ≤ 0.50
Hardness (HB) ≥ 230 ≥ 240 ≥ 200
Tensile Strength (MPa) ≥ 780 ≥ 780 ≥ 780
Rp0.2 Yield ​Strength (MPa) ≥ 680 ≥​ 650 ≥ 680
Elongation (%) ≥ 12 ≥ 16 ≥ 10
Z Reduction Area (%) ≥ 50 ≥ 60 ≥ 35
AKV Impact Value (J) ≥ 78 ≥ 78 ≥ 21

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