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US 8,783,006 B2Granted
Chain and manufacturing method of sliding member of the chain
AssigneeDaido Kogyo Co., Ltd.
InventorJun Baba
Life of this patent
Estimating the term…
Abstract
A chain includes a plurality of sliding members that moves relative to each other. At least one of sliding members is formed of a martensitic stainless steel, and contains, in a superficial layer thereof, elemental substances of carbon and nitrogen at a range from 0.17 to 0.50 mass % in total, while a precipitation amount of carbide and nitride is 0.05 mass % or less in total.
Claims17
A chain comprising:
- a plurality of sliding members that moves relative to each other, at least one of which is formed of a martensitic stainless steel, and contains, in a superficial layer thereof, elemental substances of carbon and nitrogen at a range from 0.17 to 0.50 mass % in total, while a precipitation amount of carbide and nitride is 0.05 mass % or less in total.
A chain comprising:
- a plurality of link plates;
- and
- pins that bendably link the link plates,
- wherein the pins are formed of a martensitic stainless steel, and contains, in a superficial layer thereof, elemental substances of carbon and nitrogen at a range from 0.17 to 0.50 mass % in total, while a precipitation amount of carbide and nitride is 0.05 mass % or less in total.
1 more element
A manufacturing method of a sliding member of a chain that slides against another member, the method comprising:
- a first evacuating step, wherein an environment around a sliding member made from martensitic stainless steel base material is evacuated;
- a first heating-up step, wherein a temperature of the sliding member is raised to a temperature range from 950° C. to 1050° C. after the first evacuating step;
- a first maintaining step, where the sliding member is maintained at a temperature range from 950° C. to 1050° C. for a period of time from 1 to 3 hours after the first hating step;
- a first nitrogen introducing step, wherein the environment around the sliding member is filled with nitrogen treatment gas, during a time period after the first evacuating step and before the first maintaining step;
- a first cooling step, wherein the sliding member is cooled by a nitrogen treatment gas to a normal temperature after the first maintaining step;
- a second evacuating step, wherein the environment around the sliding member is evacuated to vacuum after the first cooling step;
- a second heating-up step, wherein the sliding member is heated to a temperature range from 150° C. to 200° C. after the second evacuating step;
- a second maintaining step, wherein the sliding member is maintained at a temperature range from 150° C. to 200° C. after the second heating-up step;
- a second nitrogen introducing step, wherein the environment around the sliding member is filled with nitrogen treatment gas, during a time period after the second evacuating step and before the second maintaining step;
- and
- a second cooling step, wherein the sliding member is gradually cooled to a normal temperature after the second maintaining step.
8 more elements
Dependencies are inferred from the claim text.