Abrasion-resistant refrigeration-hardenable white cast iron

• US 3,941,589 A
• Filed: 02/13/1975
• Issued: 03/02/1976
• Est. Priority Date: 02/13/1975
• Status: Expired due to Term

• Current Assignee: AMAX
• Original Assignee: AMAX
• Inventors: Norman, Telfer E., Stolk, Douglas A.
• Primary Examiner(s): Lovell, C.
• Assistant Examiner(s): Steiner, Arthur J.
• Application Number:
  US05/549,553
• Time in Patent Office: 383 Days
• Field of Search: 75/125, 75/126 A, 75/126 B, 75/126 C, 75/123 CB, 148/35
• US Class Current: 420/15
• CPC Class Codes: C22C 37/06 containing chromium

Abstract

A tough abrasion-resistant refrigeration-hardenable white cast iron containing as its essential alloying constituents about 2.5% to about 3.5% carbon, about 2.5% to about 3.5% manganese, about 12% to about 22% chromium, about 1% to about 2% silicon, about 1.5% to about 3.0% molybdenum, about 1% to about 2% copper, and the balance iron along with conventional residual elements and incidental impurities present in usual amounts.

Claims

1. An abrasion-resistant refrigeration hardenable white cast iron consisting essentially of about 2.5% to about 3.5% carbon, about 12% to about 22% chromium, about 1.5% to about 3.0% molybdenum, about 2.5% to about 3.5% manganese, about 1.0% to about 2.0% copper, about 1% to about 2% silicon, and the balance iron together with incidental impurities and normal residual elements present in the usual amounts.

2. The abrasion-resistant refrigeration hardenable white cast iron as defined in claim 1, wherein carbon is present in an amount of about 3.0% to about 3.3%, chromium is present in an amount of about 17% to about 20%, molybdenum is present in an amount of from about 1.9% to about 2.2%, manganese is present in an amount of about 2.8% to about 3.2%, copper is present in an amount of about 1.1% to about 1.4%, silicon is present in an amount of about 1.4% to about 1.7%.

3. The abrasion-resistant refrigeration hardenable white cast iron as defined in claim 1, further characterized by a matrix microstructure free from pearlite and comprising a mixture of martensite and austenite in amounts depending on section size and treatment following casting.

4. An abrasion-resistant article in a refrigeration hardened state consisting essentially of about 2.5% to about 3.5% carbon, about 12% to about 22% chromium, about 1.5% to about 3.0% molybdenum, about 2.5% to about 3.5% manganese, about 1.0% to about 2.0% copper, about 1% to about 2% silicon, and the balance iron together with incidental impurities and normal residual elements present in the usual amounts.

5. The abrasion-resistant article in a refrigeration hardened state as defined in claim 4, wherein carbon is present in an amount of about 3.0% to about 3.3%, chromium is present in an amount of about 17% to about 20%, molybdenum is present in an amount of from about 1.9% to about 2.2%, manganese is present in an amount of about 2.8% to about 3.2%, copper is present in an amount of about 1.1% to about 1.4%, silicon is present in an amount of about 1.4% to about 1.7%.

6. The article as defined in claim 4, in the form of a component of a pump device.

7. The article as defined in claim 4, having a Brinell hardness greater than about 550.