Composite cemented carbide roll, and production method of composite cemented carbide roll

A composite cemented carbide roll comprising an inner layer made of an iron-based alloy, an intermediate layer made of cemented carbide which is metallurgically bonded to an outer peripheral surface of said inner layer, and an outer layer made of cemented carbide which is bonded to an outer peripheral surface of said intermediate layer;

• the cemented carbide forming said outer layer comprising 55-90 parts by mass of WC particles and 10-45 parts by mass of an Fe-based binder phase, and said binder phase in said outer layer having a chemical composition comprising 0.5-10% by mass of Ni, 0.2-2.0% by mass of C, 0.5-5% by mass of Cr, and 0.1-5% by mass of W, the balance being Fe and inevitable impurities;
• the cemented carbide forming said intermediate layer comprising 30-65 parts by mass of WC particles and 35-70 parts by mass of an Fe-based binder phase, and said binder phase of said intermediate layer having a chemical composition comprising 0.5-10% by mass of Ni, 0.2-2.0% by mass of C, 0.5-5% by mass of Cr, and 0.1-5% by mass of W, the balance being Fe and inevitable impurities;
• a shaft member being metallurgically bonded to at least one axial end of said inner layer, and a shaft end member being welded to said shaft member;
• said inner layer being made of an iron-based alloy comprising 0.2-0.45% by mass of C, 0.5-4.0% by mass of Cr, 1.4-4.0% by mass of Ni, and 0.10-1.0% by mass of Mo, the balance being Fe and inevitable impurities;
• and
• said shaft member and said shaft end member being made of an iron-based alloy containing 1.5% or less in total by mass of at least one selected from the group consisting of Cr, Ni and Mo.

A method for producing a composite cemented carbide roll comprising an inner layer made of an iron-based alloy and an outer layer made of cemented carbide metallurgically bonded to each other;

• said method comprising:
• arranging an outer layer material, which is a powder, green body, calcined body or sintered body of cemented carbide, around said inner layer made of an iron-based alloy comprising 0.2-0.45% by mass of C, 0.5-4.0% by mass of Cr, 1.4-4.0% by mass of Ni, and 0.10-1.0% by mass of Mo, the balance being Fe and inevitable impurities;
• abutting a shaft member made of an iron-based alloy containing 1.5% or less in total by mass of at least one selected from the group consisting of Cr, Ni and Mo on at least one axial end of said inner layer;
• sealing said outer layer material, said inner layer and said shaft member in a HIP can made of a steel material, and evacuating said HIP can;
• and
• conducting a HIP treatment to integrally bond said outer layer, said inner layer and said shaft member.

A method for producing a composite cemented carbide roll comprising an inner layer made of an iron-based alloy, an intermediate layer made of cemented carbide and an outer layer made of cemented carbide, which are metallurgically bonded to each other;

• said method comprising:
• arranging an intermediate layer material which is a powder, green body, calcined body or sintered body of cemented carbide, and an outer layer material which is a powder, green body, calcined body or sintered body of cemented carbide, around the inner layer made of an iron-based alloy comprising 0.2-0.45% by mass of C, 0.5-4.0% by mass of Cr, 1.4-4.0% by mass of Ni, and 0.10-1.0% by mass of Mo, the balance being Fe and inevitable impurities;
• abutting a shaft member made of an iron-based alloy containing 1.5% or less in total by mass of at least one selected from the group consisting of Cr, Ni and Mo on at least one axial end of said inner layer;
• sealing said outer layer material, said intermediate layer material, said inner layer and said shaft member in a HIP can made of a steel material, and evacuating said HIP can;
• conducting a HIP treatment to integrally bond said outer layer material, said intermediate layer material, said inner layer, and said shaft member.