CN106011414A - Method for improving hydrogen resistance of continuous-cast slab produced Q245R steel - Google Patents
Method for improving hydrogen resistance of continuous-cast slab produced Q245R steel Download PDFInfo
- Publication number
- CN106011414A CN106011414A CN201610539628.8A CN201610539628A CN106011414A CN 106011414 A CN106011414 A CN 106011414A CN 201610539628 A CN201610539628 A CN 201610539628A CN 106011414 A CN106011414 A CN 106011414A
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- Prior art keywords
- steel
- temperature
- heat treatment
- hydrogen
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Classifications
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/78—Combined heat-treatments not provided for above
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
-
- 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
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Abstract
The invention discloses a method for improving hydrogen resistance of continuous-cast slab produced Q245R steel, and belongs to the technical field of manufacturing of hydrogen induced cracking-resistant steel. The Q245R steel comprises 0.12-0.20 wt% of C, 0.8-1.2 wt% of Mn, Si not more than 0.35 wt%, P not more than 0.015 wt%, S not more than 0.010 wt% and the balance of Fe. The heating temperature of primary heat treatment is 870-900 DEG C; the cooling is performed after insulation; the final cooling temperature is lower than 400 DEG C; the heating temperature of secondary heating treatment is 550-600 DEG C; and the cooling is performed in air to reach the room temperature after insulation. The method has the following advantages: the method of twice heat treatment is adopted to eliminate a banded structure in a center segregation area of a continuous-cast slab produced steel plate to obtain a uniformly mixed quasi multi-deformation ferrite-tempered sorbite structure; and the hydrogen induced cracking resistance of the material is prominently improved.
Description
Technical field
The invention belongs to Resistant hydrogen introduced cracking steel manufacturing technology field, improve continuous casting steel billet particularly to one and produce Q245R
The method of steel resistant to hydrogen performance.Especially relate to a kind of continuous casting steel billet that improves and produce the heat treatment of Q245R steel resistance against hydrogen cracking performance
Method.
Background technology
Q245R is the steels for pressure vessel use that a kind of petrochemical industry is conventional, and its main alloying component includes: C content
0.12～0.24wt%, Mn content 0.8%～1.4wt%, Si content≤0.35wt%, be not added with other alloying elements, logical
Often rolling state or the delivery of normalizing state, steel plate is ferrite+pearlitic structrure.But due to occur in recent years some due to
H2There is the device damage or break accident occurred in S, makes people for H2Cause by the resistant to hydrogen of steel plate of pressure vessel under S corrosive environment
Cracking (HIC) performance proposes requirement.Hydrogen system cracking is steel a kind of common failure mode, environment gas in wet hydrogen sulfide environment
Hydrogen atom in atmosphere diffuses to inside steel plate, may assemble formation hydrogen in positions such as steel grade field trash, crystal boundary, dislocations thus sprout
Raw crackle, once crack initiation, when hydrogen pressure is more than material crack tip fracture toughness, crackle extends, thus is formed
Large-size crackle.
In order to improve the resistance against hydrogen cracking performance of pressure vessel steel, it is thus proposed that various methods, such as Japan Patent S50-
97515 add the Cu of 0.2-0.8wt% to form erosion-resisting film in X42-X80 pipe line steel, are therefore prevented from hydrogen and enter into base
In body steel.Japan Patent S53-106318 proposes add the Ca of 0.005-0.020wt% or less so that MnS is mingled with in steel
Thing nodularization is to reduce cracking sensitivity.Many patents propose to limit the hazardous elements S in steel, is mingled with reducing MnS
Thing quantity, improves resistance against hydrogen cracking performance.
But, the continuous casting steel billet that modern steel mill majority uses easily forms central segregation band in strand heart portion, even if by S content
Being reduced to extremely low level (＜ 0.003wt%), still there is a certain amount of MnS field trash, becomes crackle and sprout in rolled plate heart portion
Source of students.And the normalizing heat treatment technique that generally Q245R uses, steel plate is finally organized as ferrite+pearlite banded structure, promotes
Cracks can spread.
Summary of the invention
It is an object of the invention to provide a kind of method improving continuous casting steel billet production Q245R steel resistant to hydrogen performance, solve
The problem that continuous casting billet produces the resistance against hydrogen cracking ability of steel plate.
By the secondary heat treatment technique optimized, improve the banded structure of steel plate, improve center segregation zone shape especially, from
And improve tissue crack arrest characteristic, even if there is a certain amount of MnS field trash to become crackle originated location, it is also possible to effective suppression
Cracks can spread, thus improve the resistance against hydrogen cracking ability of steel plate.
A kind of method improving continuous casting steel billet production Q245R steel resistant to hydrogen performance, for C content 0.12～0.20wt%,
Mn content 0.8～1.2wt%, Si content≤0.35wt%, P content≤0.015wt%, S content≤0.010wt%, remaining
Q245R steel for Fe.
Concrete steps and parameter are as follows:
1, a heat treatment heating-up temperature is 870～900 DEG C, temperature retention time 1～1.4T (min/mm), wherein T after temperature
For steel plate thickness, 10 DEG C/s of rate of cooling～30 DEG C/s, final cooling temperature ＜ 400 DEG C；
2, secondary heat treatment heating-up temperature 550～600 DEG C, temperature retention time 1～1.4T (min/mm) after temperature, wherein T is
Steel plate thickness, after heat treatment, air cooling is to room temperature.
Steel plate, through being once thermally treated resulting in quasi-polygonal ferrite+martensitic structure, has effectively eliminated banded structure,
Suppression cracks can spread；But bringing the increase of material room solubility and internal stress, internal stress is by aggravation crack initiation and splits simultaneously
Stricture of vagina extends, and room inherently hydrogen is prone to agglomerated defects.In order to eliminate internal stress and room solubility, carry out secondary heat treatment.
After heat treatment, the strength of materials slightly reduces, and is organized as quasi-polygonal ferrite+tempered sorbite, equally distributed quasi-polygon ferrum
Ferritic can be with Anticrack, and material has the resistance against hydrogen cracking ability of excellence.
It is an advantage of the current invention that: the method that have employed secondary heat treatment, eliminate continuous casting steel billet and produce steel plate center segregation
Banded structure in region, the quasi-shape changeable ferrite+tempered sorbite tissue being uniformly mixed, even if steel plate heart portion exists
A certain amount of MnS is mingled with, and causes crack initiation, the effective Anticrack of ferritic structure, thus significantly improves material
Resistance against hydrogen cracking performance.
Accompanying drawing explanation
Fig. 1 is the organization charts of 1-3 sample in embodiment.
Fig. 2 is the organization charts of 2-3 sample in embodiment.
Fig. 3 is the organization charts of 3-2 sample in embodiment.
Detailed description of the invention
The present invention selects steel plate composition such as table 1, and steel plate is produced by continuous casting steel billet, and concrete production procedure is pneumatic steelmaking
LF refine application of vacuum sheet billet continuous casting heating rolling-heat treatment.
Table 1 test material ingredient w t, %
Steel plate 1 and steel plate 2 carry out the heat treatment of different process, and concrete Technology for Heating Processing is shown in Table 2
Table 2 steel plate state and heat treatment parameter
According to the test in NACE TM 0284 " test method of pipeline pressure container Resistant hydrogen introduced cracking steel performance evaluation "
Method, uses solution A that sample in embodiment carries out the inspection of resistant to hydrogen cracking performance.Result such as table 3, CLR, CTR and CSR are distributed
For crack length rate, crack width rate, crack-sensitivity rate, it is seen that sample 1-3,2-3 and 3-2 have employed the heat treatment side of this patent
Method, compared with common rolling state or normalizing state steel plate, its hydrogen induced cracking resistance can significantly improve.
Table 3 resistance against hydrogen cracking assay
Claims (2)
1. one kind is improved the method that continuous casting steel billet produces Q245R steel resistant to hydrogen performance, it is characterised in that concrete steps and parameter are such as
Under:
1) a heat treatment heating-up temperature is 870～900 DEG C, temperature retention time 1～1.4Tmin/mm after temperature, and wherein T is steel plate
Thickness, 10 DEG C/s of rate of cooling～30 DEG C/s, final cooling temperature ＜ 400 DEG C；
2) secondary heat treatment heating-up temperature 550～600 DEG C, temperature retention time 1～1.4Tmin/mm after temperature, wherein T is that steel plate is thick
Degree, after heat treatment, air cooling is to room temperature.
Method the most according to claim 1, it is characterised in that the composition of described Q245R steel is: C content 0.12～
0.20wt%, Mn content 0.8～1.2wt%, Si content≤0.35wt%, P content≤0.015wt%, S content≤
0.010wt%, remaining is Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610539628.8A CN106011414A (en) | 2016-07-08 | 2016-07-08 | Method for improving hydrogen resistance of continuous-cast slab produced Q245R steel |
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|---|---|---|---|
| CN201610539628.8A CN106011414A (en) | 2016-07-08 | 2016-07-08 | Method for improving hydrogen resistance of continuous-cast slab produced Q245R steel |
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| CN106011414A true CN106011414A (en) | 2016-10-12 |
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| CN201610539628.8A Pending CN106011414A (en) | 2016-07-08 | 2016-07-08 | Method for improving hydrogen resistance of continuous-cast slab produced Q245R steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106544483A (en) * | 2016-10-26 | 2017-03-29 | 首钢总公司 | A kind of heat treatment method of the anti-SSCC performances of raising C Mn steel plates |
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| CN103451381A (en) * | 2013-08-15 | 2013-12-18 | 成都市新筑路桥机械股份有限公司 | Thermal treatment process for low alloy structural steel and low carbon structural steel |
| CN103556047A (en) * | 2013-10-22 | 2014-02-05 | 首钢总公司 | 450MPa-grade hydrogen-induced-cracking-resistant pressure vessel steel plate and production method thereof |
| KR101412295B1 (en) * | 2012-03-29 | 2014-06-25 | 현대제철 주식회사 | High strength steel and method for manufacturing the same |
| CN104480384A (en) * | 2014-11-29 | 2015-04-01 | 首钢总公司 | Steel plate for 510MPa-grade hydrogen induced cracking resistant pressure vessel and production method of steel plate |
| CN104946993A (en) * | 2015-06-13 | 2015-09-30 | 秦皇岛首秦金属材料有限公司 | Quenched and tempered state HIC (Hydrogen Induce Crack)-resistant and SSC (Sulfide Stress Cracking)-resistant wide and thick plate and preparation method thereof |
| CN105624554A (en) * | 2016-01-15 | 2016-06-01 | 宝山钢铁股份有限公司 | Steel plate for 70-grade SA671 electric fusion welding pipe with excellent HIC resistance and manufacturing method |
-
2016
- 2016-07-08 CN CN201610539628.8A patent/CN106011414A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101412295B1 (en) * | 2012-03-29 | 2014-06-25 | 현대제철 주식회사 | High strength steel and method for manufacturing the same |
| CN103451381A (en) * | 2013-08-15 | 2013-12-18 | 成都市新筑路桥机械股份有限公司 | Thermal treatment process for low alloy structural steel and low carbon structural steel |
| CN103556047A (en) * | 2013-10-22 | 2014-02-05 | 首钢总公司 | 450MPa-grade hydrogen-induced-cracking-resistant pressure vessel steel plate and production method thereof |
| CN104480384A (en) * | 2014-11-29 | 2015-04-01 | 首钢总公司 | Steel plate for 510MPa-grade hydrogen induced cracking resistant pressure vessel and production method of steel plate |
| CN104946993A (en) * | 2015-06-13 | 2015-09-30 | 秦皇岛首秦金属材料有限公司 | Quenched and tempered state HIC (Hydrogen Induce Crack)-resistant and SSC (Sulfide Stress Cracking)-resistant wide and thick plate and preparation method thereof |
| CN105624554A (en) * | 2016-01-15 | 2016-06-01 | 宝山钢铁股份有限公司 | Steel plate for 70-grade SA671 electric fusion welding pipe with excellent HIC resistance and manufacturing method |
Non-Patent Citations (1)
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| 邹增大等: "《焊接材料、工艺及设备手册》", 31 January 2011, 化学工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106544483A (en) * | 2016-10-26 | 2017-03-29 | 首钢总公司 | A kind of heat treatment method of the anti-SSCC performances of raising C Mn steel plates |
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Application publication date: 20161012 |
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