US2015292067A1PendingUtilityA1
Hot-forming steel alloy
Assignee: BOEHLER EDELSTAHL GMBH & CO KGPriority: Nov 20, 2008Filed: Jun 25, 2015Published: Oct 15, 2015
Est. expiryNov 20, 2028(~2.3 yrs left)· nominal 20-yr term from priority
C21D 8/00C21D 1/18C22C 38/46C22C 38/001C21D 6/008C22C 38/02C21D 6/005C22C 38/24C22C 38/04C21D 6/004C22C 38/22C22C 38/44C21D 8/005
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Claims
Abstract
A hot-forming steel alloy comprising, in addition to iron and impurity elements, carbon, silicon, manganese, chromium, molybdenum, vanadium and nitrogen within the concentration ranges set forth in the claims. This abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.
Claims
exact text as granted — not AI-modified1 . A method for forming a hot-forming steel alloy, which comprises combining the following elements in the following amounts in % by weight, based on a total weight of the alloy:
Carbon (C)
from about 0.35 to about 0.42,
Silicon (Si)
from about 0.15 to about 0.29,
Manganese (Mn)
from about 0.40 to about 0.70,
Chromium (Cr)
from about 4.70 to about 5.45,
Molybdenum (Mo)
from about 1.50 to about 1.95,
Vanadium (V)
from about 0.40 to about 0.75, and
Nitrogen (N)
from about 0.011 to about 0.016;
wherein the balance of the alloy is iron and one or more impurity elements.
2 . The method of claim 1 , wherein maximum concentrations of the one or more impurity elements in % by weight, based on a total weight of the alloy are as follows:
Phosphorus (P)
not more than about 0.005,
Sulfur (S)
not more than about 0.003,
Nickel (Ni)
not more than about 0.10,
Tungsten (W)
not more than about 0.10,
Copper (Cu)
not more than about 0.10,
Cobalt (Co)
not more than about 0.10,
Titanium (Ti)
not more than about 0.008,
Niobium (Nb)
not more than about 0.03,
Oxygen (O)
not more than about 0.003,
Boron (B)
not more than about 0.001,
Arsenic (As)
not more than about 0.01,
Tin (Sn)
not more than about 0.0025,
Antimony (Sb)
not more than about 0.01,
Zinc (Zn)
not more than about 0.001,
Calcium (Ca)
not more than about 0.0002, and
Magnesium (Mg)
not more than about 0.0002.
3 . The method of claim 1 , wherein the combined elements and amounts in % by weight, based on the total weight of the alloy are as follows:
Carbon (C)
from about 0.37 to about 0.40,
Silicon (Si)
from about 0.16 to about 0.28,
Manganese (Mn)
from about 0.45 to about 0.60,
Chromium (Cr)
from about 4.80 to about 5.20,
Molybdenum (Mo)
from about 1.55 to about 1.90,
Vanadium (V)
from about 0.45 to about 0.70, and
Nitrogen (N)
from about 0.012 to about 0.015.
4 . The method of claim 1 , wherein the combined elements and amounts in % by weight, based on the total weight of the alloy are as follows:
Carbon (C)
from about 0.37 to about 0.40,
Silicon (Si)
from about 0.18 to about 0.25,
Manganese (Mn)
from about 0.50 to about 0.58,
Chromium (Cr)
from about 4.90 to about 5.10,
Molybdenum (Mo)
from about 1.65 to about 1.80,
Vanadium (V)
from about 0.52 to about 0.60, and
Nitrogen (N)
from about 0.012 to about 0.015.
5 . The method of claim 3 , wherein maximum concentrations of the one or more impurity elements in % by weight, based on a total weight of the alloy are as follows:
Phosphorus (P)
not more than about 0.005,
Sulfur (S)
not more than about 0.003,
Nickel (Ni)
not more than about 0.10,
Tungsten (W)
not more than about 0.10,
Copper (Cu)
not more than about 0.10,
Cobalt (Co)
not more than about 0.10,
Titanium (Ti)
not more than about 0.008,
Niobium (Nb)
not more than about 0.03,
Oxygen (O)
not more than about 0.003,
Boron (B)
not more than about 0.001,
Arsenic (As)
not more than about 0.01,
Tin (Sn)
not more than about 0.0025,
Antimony (Sb)
not more than about 0.01,
Zinc (Zn)
not more than about 0.001,
Calcium (Ca)
not more than about 0.0002, and
Magnesium (Mg)
not more than about 0.0002.
6 . The method of claim 4 , wherein maximum concentrations of the one or more impurity elements in % by weight, based on a total weight of the alloy are as follows:
Phosphorus (P)
not more than about 0.005,
Sulfur (S)
not more than about 0.003,
Nickel (Ni)
not more than about 0.10,
Tungsten (W)
not more than about 0.10,
Copper (Cu)
not more than about 0.10,
Cobalt (Co)
not more than about 0.10,
Titanium (Ti)
not more than about 0.008,
Niobium (Nb)
not more than about 0.03,
Oxygen (O)
not more than about 0.003,
Boron (B)
not more than about 0.001,
Arsenic (As)
not more than about 0.01,
Tin (Sn)
not more than about 0.0025,
Antimony (Sb)
not more than about 0.01,
Zinc (Zn)
not more than about 0.001,
Calcium (Ca)
not more than about 0.0002, and
Magnesium (Mg)
not more than about 0.0002.
7 . The method of claim 1 , which further comprises thermal quenching and tempering the hot-forming steel alloy.
8 . The method of claim 3 , which further comprises thermal quenching and tempering the hot-forming steel alloy.
9 . The method of claim 4 , which further comprises thermal quenching and tempering the hot-forming steel alloy.
10 . The method of claim 7 , which comprises thermal quenching and tempering the hot-forming steel alloy using cooling parameters [λ] ranging from 0 to 30, wherein the cooling parameter corresponds to the time [in seconds] for a cooling from 800° C. to 500° C. to occur divided by 100.
11 . The method of claim 8 , which comprises thermal quenching and tempering the hot-forming steel alloy using cooling parameters [λ] ranging from 0 to 30, wherein the cooling parameter corresponds to the time [in seconds] for a cooling from 800° C. to 500° C. to occur divided by 100.
12 . The method of claim 9 , which comprises thermal quenching and tempering the hot-forming steel alloy using cooling parameters [λ] ranging from 0 to 30, wherein the cooling parameter corresponds to the time [in seconds] for a cooling from 800° C. to 500° C. to occur divided by 100.
13 . The method of claim 10 , wherein the toughness of the hot-forming steel remains above a Notched Impact Strength ISO-V measured at 25° C. of 15 J/cm 2 and also remains essentially unchanged over the entire range of cooling parameters.
14 . The method of claim 11 , wherein the toughness of the hot-forming steel remains above a Notched Impact Strength ISO-V measured at 25° C. of 15 J/cm 2 and also remains essentially unchanged over the entire range of cooling parameters.
15 . The method of claim 12 , The method of claim 11 , wherein the toughness of the hot- forming steel remains above a Notched Impact Strength ISO-V measured at 25° C. of 15 J/cm 2 and also remains essentially unchanged over the entire range of cooling parameters.
16 . A method of making a part comprising a hot-forming steel alloy, wherein the method comprises combining the following elements in the following amounts in % by weight, based on a total weight of the alloy:
Carbon (C)
from about 0.35 to about 0.42,
Silicon (Si)
from about 0.15 to about 0.29,
Manganese (Mn)
from about 0.40 to about 0.70,
Chromium (Cr)
from about 4.70 to about 5.45,
Molybdenum (Mo)
from about 1.50 to about 1.95,
Vanadium (V)
from about 0.40 to about 0.75, and
Nitrogen (N)
from about 0.011 to about 0.016;
wherein the balance of the alloy is iron and one or more impurity elements.
17 . The method of claim 16 , wherein the part is selected from die-casting dies, extruders, and parts thereof.
18 . The method of claim 16 , wherein the combined elements and amounts in % by weight, based on the total weight of the alloy are as follows:
Carbon (C)
from about 0.37 to about 0.40,
Silicon (Si)
from about 0.16 to about 0.28,
Manganese (Mn)
from about 0.45 to about 0.60,
Chromium (Cr)
from about 4.80 to about 5.20,
Molybdenum (Mo)
from about 1.55 to about 1.90,
Vanadium (V)
from about 0.45 to about 0.70, and
Nitrogen (N)
from about 0.012 to about 0.015.
19 . The method of claim 16 , wherein the combined elements and amounts in % by weight, based on the total weight of the alloy are as follows:
Carbon (C)
from about 0.37 to about 0.40,
Silicon (Si)
from about 0.18 to about 0.25,
Manganese (Mn)
from about 0.50 to about 0.58,
Chromium (Cr)
from about 4.90 to about 5.10,
Molybdenum (Mo)
from about 1.65 to about 1.80,
Vanadium (V)
from about 0.52 to about 0.60, and
Nitrogen (N)
from about 0.012 to about 0.015.Join the waitlist — get patent alerts
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