Razor blade and composition for a razor blade
AssigneeEdgewell Personal Care Brands, LLC
InventorsWilliam Salvatore, Yiming Xu
Life of this patent
Estimating the term…
Abstract
A razor blade has a first and a second portion. The first portion has a cutting edge at an exterior end and is angled relative to the second portion by a bending process. A bent region that can be arcuate is intermediate the first and second portions. The razor blade is manufactured from martensitic stainless steel being mostly iron and having (by weight): 0.40 to 0.60% C; 0.30 to 0.55% Si; 0.70 to 0.90% Mn; 13.0 to 14.0% Cr; 0.50 to 1.0% Mo; and 0.03 to 0.2%, more preferably 0.03-0.1% N.
Claims19
A razor blade, comprising:
- a first portion and a second portion, the first portion having a cutting edge at an exterior end thereof and being angled relative to the second portion by a bending process;
- and
- a bent region intermediate the first portion and the second portion;
- wherein the razor blade is a martensitic stainless steel consisting essentially of mainly iron and having by weight:
- 0.40 to 0.60% Carbon
- 0.30 to 0.55% Silicon
- 0.70 to 0.90% Manganese
- 15.0 to 14% Chromium
- 0.50 to 1.0% Molybdenum
- 0.03 to 0.2% Nitrogen
- Sulphur in a range up to 0.02%
- Phosphorus in a range up to 0.0025%, and
- balance Iron.
A method of making a razor blade, comprising the steps of:
- a) providing a martensitic stainless steel strip having a width and a thickness and including a front edge portion and a back edge portion, the strip consisting essentially of mainly iron having by weight:
- 0.40 to 0.60% Carbon
- 0.30 to 0.55% Silicon
- 0.70 to 0.90% Manganese
- 15.0 to 14% Chromium
- 0.50 to 1.0% Molybdenum
- 0.03 to 0.2% Nitrogen
- Sulphur in a range up to 0.02%
- Phosphorus in a range up to 0.0025%, and
- balance Iron;
- b) hardening the strip;
- c) forming a cutting edge along at least one of the front edge portion and rear edge portion;
- d) applying a coating comprising at least a fluoropolymer material to the cutting edge and curing the fluoropolymer material to thereby anneal at least a portion containing the cutting edge to a hardness at least 550 HV;
- preferably 620-640 HV;
- e) separating the strip to provide a discrete length;
- and
- f) forming the discrete length in a bending process to provide a bent region intermediate a first portion having the cutting edge at an exterior end thereof, the first portion being angled relative to a second portion.
A method of making a razor blade, comprising the steps of:
- a) providing a martensitic stainless steel strip having a width and a thickness and including a front edge portion and a back edge portion, the strip consisting essentially of mainly iron having by weight:
- 0.40 to 0.60% Carbon
- 0.30 to 0.55% Silicon
- 0.70 to 0.90% Manganese
- 13.0 to 14% Chromium
- 0.50 to 1.0% Molybdenum
- 0.03 to 0.2% Nitrogen
- Sulphur in a range up to 0.02%
- Phosphorus in a range up to 0.0025%, and
- balance Iron;
- b) hardening the strip;
- c) forming a cutting edge along at least one of the front edge portion and rear edge portion;
- d) applying a coating to the cutting edge and curing coating to thereby anneal at least a portion containing the cutting edge to a hardness of at least 550 HV;
- e) separating the strip to provide a discrete length;
- and
- f) forming the discrete length in a bending process to provide a bent region intermediate a first portion having the cutting edge at an exterior end thereof, the first portion being angled relative to a second portion.
Dependencies are inferred from the claim text.