James E Peck

US Patent:

57729573, Jun 30, 1998

Filed:

Aug 23, 1996

Appl. No.:

8/702357

Inventors:

Iain A. Thomson - Portland OR
Larry G. Ward - Milwaukie OR
James Peck - Clackamas OR
Dwayne E. Lewis - Oregon City OR

Assignee:

Blount, Inc. - Montgomery AL

International Classification:

C22C 3844
C21D 900

US Classification:

420108

Abstract:

An iron composition and method for processing the composition that produces a steel alloy having enhanced low temperature toughness, without compromising other desirable mechanical properties, is described. The composition can be used to produce devices, such as saw chain, particularly useful for low temperature applications. In general, the steel composition comprises from about 0. 2 weight percent to about 0. 4 weight percent nickel, from about 0. 2 to about 0. 4 weight percent chromium, from about 0. 5 weight percent to about 1. 0 weight percent carbon, from about 0. 3 to about 0. 5 weight percent manganese, from about 0. 1 to about 0. 35 weight percent silicon, and from about 0. 08 weight percent to about 0. 20 weight percent molybdenum.

US Patent:

56519389, Jul 29, 1997

Filed:

May 1, 1995

Appl. No.:

8/431438

Inventors:

Iain A. Thomson - Portland OR
Larry G. Ward - Milwaukie OR
James Peck - Milwaukie OR
Dwayne E. Lewis - Oregon City OR

Assignee:

Blount, Inc. - Montgomery AL

International Classification:

C22C 3808
C22C 3812

US Classification:

420119

Abstract:

An iron composition and method for processing the composition that produces a steel alloy having enhanced low temperature toughness, without compromising other desirable mechanical properties, is described. The composition can be used to produce devices, such as saw chain, particularly useful for low temperature applications. In general, the steel composition comprises from about 0. 2 weight percent to about 0. 4 weight percent nickel, from about 0. 2 to about 0. 4 weight percent chromium, from about 0. 5 weight percent to less than about 1. 0 weight percent carbon, from about 0. 3 to about 0. 5 weight percent manganese, and from about 0. 08 weight percent to about 0. 20 weight percent molybdenum. After heat treating, the steel composition has an average fracture toughness of greater than about 42 ksi in. sup. 1/2, and an average modified Charpy energy-to-failure of greater than about 2 ft.