CN104630652B - A kind of low-alloy heat-resistant high-strength steel, steel beam column and preparation method thereof - Google Patents
A kind of low-alloy heat-resistant high-strength steel, steel beam column and preparation method thereof Download PDFInfo
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- CN104630652B CN104630652B CN201510075055.3A CN201510075055A CN104630652B CN 104630652 B CN104630652 B CN 104630652B CN 201510075055 A CN201510075055 A CN 201510075055A CN 104630652 B CN104630652 B CN 104630652B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
Abstract
The present invention relates to a kind of low-alloy heat-resistant high-strength steel, steel beam column and preparation method thereof.Described low-alloy heat-resistant high-strength steel, by weight percentage, comprises following components：C 0.04～0.06, Si 0.06～0.2, Mn 0.06～0.35, Cr 1.3～1.5, Pd 0.35～0.45, P≤0.009, S≤0.006, Ni 0.2～0.4, Cu 0.01～0.08, V 0.3～0.4, Nb 0.1～0.2, W 0.2～0.5, Ti 0.005～0.02, balance of Fe and inevitable impurity.Using the low-alloy heat-resistant high-strength steel component of present invention preparation, there is higher mechanical properties, yield point and case hardness.
Description
Technical field
The present invention relates to a kind of ferrous materials, especially a kind of low-alloy heat-resistant high-strength steel, steel beam column and preparation method thereof.
Background technology
(it is often referred to more than 0.3～0.5 times of material melting point of temperature) under hot conditionss, there is non-oxidizability and sufficiently high
The steel of warm intensity and good heat resistance is referred to as heat resisting steel, and in heat resisting steel, a most representational class is low-alloy refractory
The 15CrMo of high-strength steel, such as China is a kind of typical low-alloy heat-resistant high-strength steel, and 15CrMo is because of its good thermostability
Energy, mechanical property, decay resistance and be widely used in boiler, petrochemical industry, coal conversion, steam turbine wheel cylinder body, thermoelectricity, nuclear power
, the pipeline of main equipment of corrosive medium complexity, container, parts etc. harsh etc. use condition.
General 15CrMo chemical composition (mass fraction) (%) is：C 0.12～0.18, Mn 0.40～0.70, Si
0.17～0.37, Cr 0.80～1.10, Mo 0.40～0.55, Ni≤0.30, S≤0.035, P≤0.035.The power of 15CRMO
Learn performance：Tension intensity is 440～640MPA, yield point about 235MPa, percentage elongation 21% about.
Developing rapidly however as modern industry, 15CrMo heat-resistance high-strength steel has been increasingly difficult to meet industrial equipment
In the higher requirement of the aspects such as obdurability, creep properties, weldability, in the production engineering such as optimized alloy composition, adjustment are smelted, rolling
Technological parameter be increasingly becoming people's focus of interest for improving 15CrMo steel.Simultaneously as needs to be obtained is excellent
Wearability and fatigue durability etc. in addition it is also necessary to the heat treatments such as carburizing and quenching are carried out to it, and this so that product is produced certain
Deformation and affect the dimensional accuracy of product.
A kind of preparation of low-alloy heat-resistant high-strength steel component is disclosed in CN102433513A, by weight percentage, bag
Containing following components：C 0.09～0.11, Si 0.06～0.2, Mn 0.06～0.35, Cr 1.3～1.5, Mo 0.35～0.45,
P≤0.009, S≤0.006, Ni 0.2～0.4, Cu 0.01～0.08, V 0.3～0.4, Nb 0.1～0.2, W 0.2～
0.5, Ti 0.005～0.02, balance of Fe and inevitable impurity.The room temperature tensile intensity of this component is 610MPa,
At 600 DEG C, under 200MPa stress test, its useful life is about the twice of 15CrMo, and the case hardness after heat treatment is about
750HV, and the thin hardened layer more than 500HV for the hardness is 0.5mm, and deflection is little, has been above general 15CrMo.But
The metal species comprising are many, and production cost is higher, it is possible to create impurity component also more complicated.
Content of the invention
For the problems referred to above, the purpose of the present invention is the composition of optimization design 15CrMo steel, and adjustment is smelted, rolled
The technological parameter of system, heat treatment etc., thus deform after preparing a kind of obdurability, corrosion resistance, welding property excellent and heat treatment
Little new low-alloy heat-resistant high-strength steel and its component product.
The technical solution adopted in the present invention is as follows：
The invention provides a kind of low-alloy heat-resistant high-strength steel, by weight percentage, comprise following components：C 0.04～
0.06, Si 0.06～0.2, Mn 0.06～0.35, Cr 1.3～1.5, Pd 0.35～0.45, P≤0.009, S≤0.006,
Ni 0.2～0.4, Cu 0.01～0.08, V 0.3～0.4, Nb 0.1～0.2, W 0.2～0.5, Ti 0.005～0.02, remaining
Measure as Fe and inevitable impurity.
The invention provides a kind of preparation method of low-alloy heat-resistant high-strength steel component, comprise the steps：
First, design the composition of described low-alloy heat-resistant high-strength steel, with weight, comprise：C 0.04～
0.06, Si 0.06～0.2, Mn 0.06～0.35, Cr 1.3～1.5, Pd 0.35～0.45, P≤0.009, S≤0.006,
Ni 0.2～0.4, Cu 0.01～0.08, V 0.3～0.4, Nb 0.1～0.2, W 0.2～0.5, Ti 0.005～0.02, remaining
Measure as Fe and inevitable impurity；
Second, smelt cast；
3rd, rolling；
4th, the processing of component；
5th, the heat treatment of component.
Preferably, a kind of preparation method of low-alloy heat-resistant high-strength steel component, comprises the steps：
First, design the composition of described low-alloy heat-resistant high-strength steel, with weight, comprise：C 0.04～
0.06, Si 0.06～0.2, Mn 0.06～0.35, Cr 1.3～1.5, Pd 0.35～0.45, P≤0.009, S≤0.006,
Ni 0.2～0.4, Cu 0.01～0.08, V 0.3～0.4, Nb 0.1～0.2, W 0.2～0.5, Ti 0.005～0.02, remaining
Measure as Fe and inevitable impurity；
Second, smelt cast, refine including at the beginning of electric arc furnace, ladle RH is processed and LF process, control molten steel to meet chemical composition
Argon is carried out at least 5 minutes with the pressure of more than 3atm, to be conducive to the floating of impurity during cast, wherein ladle refining after requirement
Remove；
3rd, rolling, include all heat-treated, rolling and cool down, wherein all heat-treated be about 1100～1150 DEG C add
Soaking at least 4～6 hours in hot stove, the start rolling temperature of rolling is about 1000～1100 DEG C, about 840～880 DEG C of finishing temperature,
Rate of cooling is about 5～10 DEG C/s, final cooling temperature is about 650～680 DEG C；
4th, the processing of component, the low-alloy heat-resistant high-strength steel after rolling is processed into the size and dimension of needs, preparation
Obtain component；
5th, the heat treatment of component, component is put into Carburization Treatment furnace rear with vertical state, is heated to about 870～900
DEG C, and methanol is instilled with the speed of about 80～100 droplets/minute, pass through to control the flow of propane to maintain in stove carbon potential 0.8 simultaneously
～0.9%, it is diffused Carburization Treatment about 2～2.5 hours, subsequently component is pre-chilled to about 750～780 DEG C and reduces in stove simultaneously
Carbon potential to about 0.7～0.75% and is incubated about 5～10 minutes, then takes out component from carburizer and is about 120 in oil temperature
Direct quenching in～140 DEG C of cooling oil, is tempered after quenching again, and temperature is about 160～180 DEG C, and tempering time is about
For 1～1.5 hour.
The invention provides a kind of low-alloy heat-resistant high-strength steel component, it is prepared from using said method.
Compared with prior art, especially compared with CN102433513A, Pd is substituted Mo and reduces C content by the present invention, steel
Elevated temperature strength do not reduce, be improved on the contrary, its mechanism needs to be studied further.
Using the present invention preparation low-alloy heat-resistant high-strength steel component, have higher mechanical properties, yield point and
Case hardness.
Specific embodiment
With reference to embodiment, the invention will be further described.
Embodiment 1
A kind of low-alloy heat-resistant high-strength steel and its component, itself through the following steps that preparing,
(1) design the composition of described low-alloy heat-resistant high-strength steel, with weight (%), comprise：C 0.05, Si
0.1, Mn 0.2, Cr 1.2, Pd 0.4, P0.009, S0.006, Ni 0.3, Cu 0.05, V 0.35, Nb 0.15, W 0.3, Ti
0.01, balance of Fe and inevitable impurity；
(2) smelt cast, refine including at the beginning of electric arc furnace, ladle RH is processed and LF process, controlling molten steel to meet chemical composition will
During cast, wherein ladle refining, Argon is carried out 5 minutes with the pressure of 5atm after asking, removed with the floating being conducive to impurity；
(3) roll, including all heat-treated, rolling and cooling, wherein all heat-treated is soaking 5 in 1130 DEG C of heating furnace
Hour, the start rolling temperature of rolling is 1050 DEG C, finishing temperature is 860 DEG C, and rate of cooling is 8 DEG C/s, final cooling temperature is 670 DEG C；
(4) processing of component, the low-alloy heat-resistant high-strength steel after rolling is processed into the size and dimension of needs, is prepared into
To component；
(5) heat treatment of component, component is put into Carburization Treatment furnace rear with vertical state, and vertical state here refers to
Keep vertical by the longest one-dimensional of components three-dimensional to be defined as far as possible, be heated to 890 DEG C, and methanol is instilled with the speed of 90 droplets/minute,
Pass through to control the flow of propane to maintain carbon potential in stove 0.85%, to be diffused Carburization Treatment 2 hours simultaneously, subsequently that component is pre-
Be as cold as 760 DEG C simultaneously reduce stove in carbon potential to 0.7% and be incubated 10 minutes, then component is taken out and in oil temperature from carburizer
For direct quenching in 125 DEG C of cooling oils, it is tempered after quenching, temperature is 170 DEG C, tempering time is 1.5 hours again.
Obtain the low-alloy heat-resistant high-strength steel component of the present invention.
Comparative example 1
According to embodiment 1 methods described, the composition of low-alloy heat-resistant high-strength steel in embodiment 1 is replaced with, described low conjunction
The composition of golden heat-resistance high-strength steel, with weight (%), comprises：C 0.1, Si 0.1, Mn 0.2, Cr 1.2, Mo
0.4, P 0.009, S 0.006, Ni 0.3, Cu 0.05, V 0.35, Nb 0.15, W 0.3, Ti 0.01, balance of Fe and not
Evitable impurity.Obtain the steel beam column of comparative example 1.
Comparative example 2
According to embodiment 1 methods described, the composition of low-alloy heat-resistant high-strength steel in embodiment 1 is replaced with, described low conjunction
The composition of golden heat-resistance high-strength steel, with weight (%), comprises：C 0.05, Si 0.1, Mn 0.2, Cr 1.2, Mo
0.4, P 0.009, S 0.006, Ni 0.3, Cu 0.05, V 0.35, Nb 0.15, W 0.3, Ti 0.01, balance of Fe and not
Evitable impurity.Obtain the steel beam column of comparative example 2.
Comparative example 3
According to embodiment 1 methods described, the composition of low-alloy heat-resistant high-strength steel in embodiment 1 is replaced with, described low conjunction
The composition of golden heat-resistance high-strength steel, with weight (%), comprises：C 0.1, Si 0.1, Mn 0.2, Cr 1.2, Pd
0.4, P 0.009, S 0.006, Ni 0.3, Cu 0.05, V 0.35, Nb 0.15, W 0.3, Ti 0.01, balance of Fe and not
Evitable impurity.Obtain the steel beam column of comparative example 3.
Test case
The steel beam column that embodiment 1 and comparative example 1-3 are obtained carries out performance test, and testing standard and test result are shown in Table 1.
Table 1：Steel beam column performance test table
| Mechanical properties (MPa) | Yield point (MPA) | Case hardness (HV) | |
| Embodiment 1 | 652 | 388 | 778 |
| Comparative example 1 | 612 | 372 | 740 |
| Comparative example 2 | 615 | 374 | 750 |
| Comparative example 3 | 620 | 381 | 765 |
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, and any
Those of ordinary skill in the art disclosed herein technical scope in, the change that can expect without creative work or
Replace, all should be included within the scope of the present invention.Therefore, protection scope of the present invention should be limited with claims
Fixed protection domain is defined.
Claims (4)
1. a kind of low-alloy heat-resistant high-strength steel, by weight percentage, is grouped into by following groups：C 0.04～0.06, Si 0.06
～0.2, Mn 0.06～0.35, Cr 1.3～1.5, Pd 0.35～0.45, P≤0.009, S≤0.006, Ni 0.2～0.4,
Cu 0.01～0.08, V 0.3～0.4, Nb 0.1～0.2, W 0.2～0.5, Ti 0.005～0.02, balance of Fe and can not
The impurity avoiding.
2. a kind of preparation method of low-alloy heat-resistant high-strength steel component, comprises the steps：
First, the composition of design low-alloy heat-resistant high-strength steel, with weight, it is grouped into by following groups：C 0.04～
0.06, Si 0.06～0.2, Mn 0.06～0.35, Cr 1.3～1.5, Pd 0.35～0.45, P≤0.009, S≤0.006,
Ni 0.2～0.4, Cu 0.01～0.08, V 0.3～0.4, Nb 0.1～0.2, W 0.2～0.5, Ti 0.005～0.02, remaining
Measure as Fe and inevitable impurity；
Second, smelt cast；
3rd, rolling；
4th, the processing of component；
5th, the heat treatment of component.
3. the preparation method of low-alloy heat-resistant high-strength steel component as claimed in claim 2, comprises the steps：
First, design the composition of described low-alloy heat-resistant high-strength steel, with weight, be grouped into by following groups：C
0.04～0.06, Si 0.06～0.2, Mn 0.06～0.35, Cr 1.3～1.5, Pd 0.35～0.45, P≤0.009, S≤
0.006, Ni 0.2～0.4, Cu 0.01～0.08, V 0.3～0.4, Nb 0.1～0.2, W 0.2～0.5, Ti 0.005～
0.02, balance of Fe and inevitable impurity；
Second, smelt cast, refine including at the beginning of electric arc furnace, ladle RH is processed and LF process, control molten steel to meet chemical composition and require
After pour into a mould, wherein ladle refining when Argon is carried out at least 5 minutes with the pressure of more than 3atm, gone with the floating being conducive to impurity
Remove；
3rd, rolling, including all heat-treated, rolling and cooling, wherein all heat-treated is in 1100～1150 DEG C of heating furnace
Soaking 4～6 hours, the start rolling temperature of rolling is 1000～1100 DEG C, finishing temperature is 840～880 DEG C, rate of cooling is 5～
10 DEG C/s, final cooling temperature be 650～680 DEG C；
4th, the processing of component, the low-alloy heat-resistant high-strength steel after rolling is processed into the size and dimension of needs, prepares
Component；
5th, the heat treatment of component, component is put into Carburization Treatment furnace rear with vertical state, is heated to 870～900 DEG C, and
Methanol is instilled with the speed of 80～100 droplets/minute, pass through to control simultaneously the flow of propane maintain in stove carbon potential 0.8～
0.9%, be diffused Carburization Treatment 2～2.5 hours, subsequently by component be pre-chilled to 750～780 DEG C simultaneously reduce stove in carbon potential extremely
0.7～0.75% and be incubated 5～10 minutes, the cooling then component taken out from carburizer and be 120～140 DEG C in oil temperature
Direct quenching in oil, is tempered after quenching again, and temperature is 160～180 DEG C, and tempering time is 1～1.5 hour.
4. a kind of low-alloy heat-resistant high-strength steel component, is prepared from using Claims 2 or 3 methods described.
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