Low-alloy steel
AssigneeELSmidth A/S
InventorsKRANTHI PEDDETI, JOHNNY JOHANSEN, NAVEEN SEELAM
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Abstract
Provided is a low-alloy steel having a chemical composition comprising, in terms of % by mass, 0.6-0.8 C, 0.4-0.6 Si, 0.8-1.3 Mn, 2.0-3.0 Cr, 0.45-0.20 Ni, 0.45-0.65 Mo, 0.001-0.045 Ti, 0.015-0.05 Ce, 0.0002-0.007 B, and at least one of the compounds, in terms of % by mass, selected from 0.10-0.45 V, 0.15-0.50 W, and/or 0.05-0.35 Nb, and the remainder being of iron (Fe) and inevitable impurities.
Claims15
A low-alloy steel having a chemical composition comprising, in terms of % by mass:
- Min.
- Max.
- Elements
- % by mass
- % by mass
- C
- 0.6
- 0.8
- Si
- 0.40
- 0.60
- Mn
- 0.80
- 1.30
- Cr
- 2.0
- 3.0
- Ni
- 0.045
- 0.20
- Mo
- 0.45
- 0.65
- Ti
- 0.001
- 0.045
- Ce
- 0.015
- 0.05
- B
- 0.0002
- 0.007
- and at least one of the compounds, in terms of % by mass, selected from
- Min.
- Max.
- Elements
- % by mass
- % by mass
- V
- 0.10
- 0.45
- W
- 0.15
- 0.50
- Nb
- 0.05
- 0.35
- and the remainder being of iron (Fe) and inevitable impurities.
The low-alloy steel according to any previous claim, wherein the microstructure of the low-alloy steel is a tempered martensite with finely dispersed carbides particles.
The low-alloy steel according to any previous claim,
- wherein the low-alloy steel comprises at least two of the elements listed below in the specified amounts:
- Min.
- Max.
- Elements
- % by mass
- % by mass
- V
- 0.10
- 0.45
- W
- 0.15
- 0.50
- Nb
- 0.05
- 0.35
- or
- wherein the low alloy steel comprises the below elements in the specified amounts:
- Min.
- Max.
- Elements
- % by mass
- % by mass
- V
- 0.10
- 0.45
- W
- 0.15
- 0.50
- Nb
- 0.05
- 0.35
The low-alloy steel according to any previous claim, having a Brinell Hardness Number after casting above 400 BHN, preferably above 500 BHN, more preferably above 550 BHN, measured on specimen prepared according to Japanese Industrial Standards (JIS) G 0307 and measured according to ASTM A370/E10, and/or
- having a Toughness of above 15 J in un-notched charpy impact test, preferably above 20 J in unnotched charpy impact test, preferably above 30 J in unnotched charpy impact test, preferably above 50 J in unnotched charpy impact test, measured on specimen prepared according to Japanese Industrial Standards (JIS) G 0307 and measured according to ASTM A370/E10.
The low-alloy steel according to any previous claim having a Hardness after casting of at least 450 BHN, measured on specimen prepared according to Japanese Industrial Standards (JIS) G 0307 and measured according to ASTM A370/E10, and a Toughness of at least 10 J in un-notched condition, measured on specimen prepared according to Japanese Industrial Standards (JIS) G 0307 and measured according to ASTM A370/E10, preferably a Hardness of at least 500 BHN and a Toughness of at least 15 J in un-notched condition, most preferably a Hardness of at least 550 BHN and a Toughness of at least 16 J in un-notched condition.
Dependencies are inferred from the claim text.