US 11,155,905 B2Granted

Enhanced wear resistant steel and methods of making the same

AssigneesExxonMobil Research and Engineering Company, Posco

InventorsHyunwoo Jin, Ning Ma, Raghavan Ayer, Russell Robert Mueller, Hak-Cheol Lee, Jong-Kyo Choi, In-Shik Suh

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Abstract

Improved steel compositions and methods of making the same are provided. The present disclosure provides advantageous wear resistant steel. More particularly, the present disclosure provides high manganese (Mn) steel having enhanced wear resistance, and methods for fabricating high manganese steel compositions having enhanced wear resistance. The advantageous steel compositions/components of the present disclosure improve one or more of the following properties: wear resistance, ductility, crack resistance, erosion resistance, fatigue life, surface hardness, stress corrosion resistance, fatigue resistance, and/or environmental cracking resistance. In general, the present disclosure provides high manganese steels tailored to resist wear and/or erosion.

Claims14

Dependent claims

A method for fabricating a ferrous based component, the method comprising:

(a) providing a composition having:
from about 5 to about 40 weight % manganese,
from about 0.01 to about 3.0 weight % carbon,
from about 3 to about 30 weight % chromium,
from about 0.001 to about 3 weight % nitrogen,
from 0 to about 15 weight % aluminum,
from 0 to about 10 weight % silicon,
from 0 to about 10 weight % copper,
from 0 to about 10 weight % niobium,
from 0 to about 10 weight % vanadium,
from 0 to about 10 weight % titanium,
from 0 to about 20 weight % nickel,
from 0 to about 1 weight % boron,
from 0 to about 20 weight % cobalt,
from 0 to about 10 weight % molybdenum,
from 0 to about 10 weight % tungsten,
from 0 to about 10 weight % tantalum,
from 0 to about 6 weight % zirconium,
from 0 to about 6 weight % hafnium,
from 0 to about 6 weight % lanthanum,
from 0 to about 6 weight % scandium,
from 0 to about 6 weight % cerium, and
the balance iron;
(b) heating the composition to at least about 1000° C.;
(c) cooling the composition at a rate of from about 2° C. per second to about 60° C. per second, followed by hot rolling the composition at a temperature in a range of about 700° C. to about 1000° C.;
(d) slowly cooling or isothermally holding the composition;
and
(e) quenching or accelerated cooling or air cooling the composition from a temperature in a range of from 700° C. to about 1000° C. to a temperature in a range of from 0° C. to about 500° C. at a rate of at least about 10° C. per second.

25 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/977,796Filed 11 May 2018 · division
Priority: 15 Mar 2013
Published: US 2018/0258515 A113 Sep 2018
Granted: 26 Oct 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

C22C 38/38
Containing chromium: with more than 1.5% by weight of manganese
C21D 6/005
Heat treatment of ferrous alloys: containing Mn
C21D 8/00
Modifying the physical properties of ferrous metals or ferrous alloys by deformation
C22C 38/02
Ferrous alloys, e.g. steel alloys: containing silicon

Family

Application61/790,274Us provisional application · filed 15 Mar 2013
Application14/196,010Parent of this division · filed 4 Mar 2014
US 2018/0258515 A1Pre-grant publication · published 13 Sep 2018
US 2014/0261918 A1Published application
US 11,155,905 B2This patent

From the US filing history. Foreign family members aren’t listed.