阅读说明：本技术 具有增强的抗氧化性的用于热冲压的钢 (Steel for hot stamping with enhanced oxidation resistance ) 是由 卢琦 庞佳琛 王建锋 于 2017-12-28 设计创作，主要内容包括：提供一种合金组合物。所述合金组合物包含大于或等于大约0.5重量%至小于或等于大约9重量%的浓度的铬(Cr)、大于或等于大约0.15重量%至小于或等于大约0.5重量%的浓度的碳(C)、大于或等于大约0重量%至小于或等于大约3重量%的浓度的锰(Mn)、大于或等于大约0.5重量%至小于或等于大约2重量%的浓度的硅(Si),且所述合金组合物的余量是铁。还提供由所述合金组合物制造成型钢物体的方法。(An alloy composition is provided. The alloy composition includes chromium (Cr) at a concentration of greater than or equal to about 0.5 wt% to less than or equal to about 9 wt%, carbon (C) at a concentration of greater than or equal to about 0.15 wt% to less than or equal to about 0.5 wt%, manganese (Mn) at a concentration of greater than or equal to about 0 wt% to less than or equal to about 3 wt%, silicon (Si) at a concentration of greater than or equal to about 0.5 wt% to less than or equal to about 2 wt%, and a balance of the alloy composition is iron. Also provided is a method of manufacturing a shaped steel object from the alloy composition.)

1. An alloy composition, comprising:

chromium (Cr) at a concentration of greater than or equal to about 0.5 wt% to less than or equal to about 9 wt%;

carbon (C) in a concentration of greater than or equal to about 0.15 wt% to less than or equal to about 0.5 wt%;

manganese (Mn) at a concentration of greater than or equal to about 0 wt% to less than or equal to about 3 wt%;

silicon (Si) at a concentration of greater than or equal to about 0.5 wt% to less than or equal to about 2 wt%; and is

The balance of the alloy composition is iron.

2. The alloy composition of claim 1, wherein the alloy composition comprises Si in a concentration greater than or equal to about 0.6 wt.% to less than or equal to about 1.5 wt.%.

3. The alloy composition of claim 1, wherein the alloy composition comprises Cr at a concentration of greater than or equal to about 2 wt.% to less than or equal to about 3 wt.%.

4. The alloy composition of claim 1, wherein the alloy composition further comprises:

aluminum (Al) in a concentration of greater than or equal to about 0 wt% to less than or equal to about 5 wt%.

5. The alloy composition of claim 1, wherein the alloy composition further comprises:

nitrogen (N) at a concentration of greater than or equal to about 0 wt% to less than or equal to about 0.01 wt%.

6. The alloy composition of claim 1, wherein the alloy composition further comprises at least one of:

molybdenum (Mo) in a concentration of greater than or equal to about 0 wt% to less than or equal to about 1 wt%;

nickel (Ni) at a concentration of greater than or equal to about 0 wt% to less than or equal to about 1 wt%;

boron (B) at a concentration of greater than or equal to about 0 wt% to less than or equal to about 0.01 wt%;

niobium (Nb) in a concentration of greater than or equal to about 0 wt% to less than or equal to about 0.5 wt%; and

vanadium (V) at a concentration of greater than or equal to about 0 wt% to less than or equal to about 0.5 wt%.

7. The alloy composition of claim 1, wherein said alloy composition is in the form of an alloy coil.

8. The alloy composition of claim 7, wherein said alloy coil comprises ferrite, martensite, and Retained Austenite (RA).

9. The alloy composition of claim 7, wherein said alloy composition has been subjected to a quenching and partitioning process.

10. A hot stamping method of forming a shaped steel object, the hot stamping method comprising:

austenitizing a billet comprising the alloy composition of claim 1;

stamping the austenitized blank to form a shaped object; and

quenching the shaped object to form a shaped steel object.

11. A cold stamping method of forming a shaped steel object, the cold stamping method comprising:

cutting a billet from a coil comprising an alloy composition according to claim 1, wherein said alloy composition has been subjected to a quenching and partitioning process; and

stamping the blank into a predetermined shape at ambient temperature to form a shaped steel object.

12. A method of forming a shaped steel object; the method comprises the following steps:

cutting a billet from a coil of an alloy composition comprising:

chromium (Cr) at a concentration of greater than or equal to about 0.5 wt% to less than or equal to about 9 wt%,

carbon (C) in a concentration of greater than or equal to about 0.15 wt% to less than or equal to about 0.5 wt%,

manganese (Mn) at a concentration of greater than or equal to about 0 wt% to less than or equal to about 3 wt%,

silicon (Si) at a concentration of greater than or equal to about 0.5 wt.% to less than or equal to about 2 wt.%, and

the balance of the alloy composition is iron;

heating the blank to a temperature above an upper critical temperature (Ac3) of the alloy composition to form a heated blank comprising austenite;

stamping the heated blank into a predetermined shape to form a stamped object; and

quenching the stamped object to form a shaped steel object, wherein the shaped steel object comprises martensite.

13. The method of claim 12, wherein the quenching comprises reducing the temperature of the stamped object at a rate of greater than or equal to about 15 ℃/s until the stamped object reaches a temperature below the martensitic transformation end (Mf) temperature of the alloy composition.

14. The method according to claim 12, wherein the method is absent of pre-oxidized alloy compositions, plated shaped steel objects, and shot peening.

15. The method of claim 12, wherein the quenching comprises a quenching and partitioning process, wherein the quenching and partitioning process comprises:

reducing the temperature of the stamped object until the stamped object has a temperature between a martensite start (Ms) temperature of the alloy composition and a martensite finish (Mf) temperature of the alloy composition;

incubating the stamped object at a partitioning temperature, wherein carbon (C) is partitioned from martensite into austenite; and

the austenite Mf temperature is lowered to below room temperature.

16. The method according to claim 15, wherein the quenching and partitioning process forms a shaped steel object, wherein the shaped steel object comprises ferrite, martensite and Retained Austenite (RA).

17. A method according to claim 16, wherein the shaped steel object is substantially free of cementite.

18. A method of forming a shaped steel object; the method comprises the following steps:

cutting blanks from coils of Advanced High Strength Steel (AHSS); and

stamping the blank into a predetermined shape at ambient temperature to form a shaped steel object,

wherein the AHSS is manufactured by subjecting an alloy composition to a quenching and partitioning process, the alloy composition comprising:

chromium (Cr) at a concentration of greater than or equal to about 0.5 wt% to less than or equal to about 9 wt%,

carbon (C) in a concentration of greater than or equal to about 0.15 wt% to less than or equal to about 0.5 wt%,

manganese (Mn) at a concentration of greater than or equal to about 0 wt% to less than or equal to about 3 wt%,

silicon (Si) at a concentration of greater than or equal to about 0.5 wt.% to less than or equal to about 2 wt.%, and

the balance of the alloy composition is iron.

19. The method of claim 18, wherein the AHSS is substantially free of an oxide layer.

20. The method according to claim 18, wherein the shaped steel object is bare or zinc (Zn) coated.