CN102644036B - High-strength reinforcing steel bar with spiral fins and processing method of high-strength reinforcing steel bar - Google Patents
High-strength reinforcing steel bar with spiral fins and processing method of high-strength reinforcing steel bar Download PDFInfo
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Abstract
The invention relates to a reinforcing steel bar and a processing method thereof, in particular to a high-strength reinforcing steel bar with spiral fins and a processing method of the high-strength reinforcing steel bar. The high-strength reinforcing steel bar consists of following components including, in weight percentage, from 0.25 to 0.4% of C, from 0.1 to 0.2% of Si, from 0.3 to 0.45% of Mn, from 0.04 to 0.05% of Nb, from 0.08 to 0.09% of Cr, from 0.01 to 0.04% of V, from 0.002 to 0.003% of B, from 0.001 to 0.003% of Mo, from 0.015 to 0.03 of Al, from 0.002 to 0.003% of S, from 0.008 to 0.009% of Ti, from 0.004 to 0.005% of Ni, from 3 to 5% of composite rear earth and the balance Fe. The processing method includes using a roll to roll a reinforcing steel bar into a reinforcing steel bar with the continuous spiral fins on the surface in a hot state; feeding the reinforcing steel bar with the continuous spiral fins on the surface after hot rolling into a heating furnace and heating the reinforcing steel bar to the temperature of 880-990 DEG C; then fast cooling the reinforcing steel bar to the temperature of 650-680 DEG C by an online cooling device via compressed air or vaporous quenching liquid; quenching in a quenching device by water or quenching liquid for 15-25 seconds; and tempering after heating the reinforcing steel bar to the temperature of 500-550 DEG C via a tempering heating furnace. The high-strength reinforcing steel bar with the spiral fins has a good anchoring property, fine ductility and a high yielding-to-tensile ratio.
Description
Technical field
The present invention relates to a kind of reinforcing bar and working method thereof, specifically a kind of high-strength spiral ribbed reinforced bar and working method thereof.
Background technology
Reinforcing bar commonly used at present is Deformed Steel Bars, is specially outside surface and has crescent screw thread with ribbing, and screw thread is vertical convex tendon, the cross rib tooth engaged, and discontinuous.All by the standard formulation of five sixties Soviet Union's structural steels, bar diameter specifically is widely used in building field to the size of this Deformed Steel Bars between 6～50mm, and uses till today always.Because the basic circle area occupation ratio of this Deformed Steel Bars physical dimension is 0.94, can not be stressed because of cross rib, useful area will lose about 6%～11%.Because the surface of this reinforcing bar has vertical convex tendon, it is on the weak side with concrete cohesive force and bond stress to be used for reinforced concrete works, Steel Concrete because vertical convex tendon on surface makes concrete to the both sides splitting easily, is unfavorable for the interlock between concrete and the reinforcing bar under strained condition; And the cross rib tooth engaged is disperseed, and easily squeezes broken cut-out, namely loses anchor force under the big slippage, and anchoring ductility is poor.
The application of spiral ribs in steel appears in the helix rib steel wire (being cold-drawn steel wire for prestressed concrete) first, be specially the surface and have the salient rib of 4 continuous shapes, helix rib steel wire is compared Deformed Steel Bars remarkable advantages, be embodied in: the anchoring property that ⑴ is good, the salient rib of shape makes the continuous concave-convex clutch tooth of formation between steel wire and concrete continuously, thereby reaches desirable anchoring effect; ⑵ steel wire cross-sectional area is without any loss, though steel wire forms rough surface topography through drawing, steel wire entire body cross section equates that cross-sectional area is without any loss; ⑶ spiral ribs appearance is more reasonable, and spiral ribs is continuous on the one hand, and the long-pending weakening of basal plane is less, and the flank area still can bear pulling force; And Ribbed Bar (Deformed Steel Bars) can not be stressed because of cross rib, and useful area will lose about 6%-11%; Helix rib steel wire has the better anchoring strength and stiffness on the other hand, and still has than large bearing capacity (anchoring ductility is good) during big slippage, is conducive to antidetonation; ⑷ many spiral ribs of helix rib steel wire rat, the concrete tooth engaged is generous and uninterrupted continuously, is difficult for fragmentation, cuts off; Squish area is big, and finned surface is long-pending big relatively, and splitting power is evenly non-directional, therefore has better anchoring ductility during little and later stage of early stage slippage gross distortion, and general Ribbed Bar cross rib (Deformed Steel Bars) tooth engaged disperses easily to squeeze broken cut-out, namely loses anchor force under the big slippage, and anchoring ductility is poor.
Above advantage be Deformed Steel Bars do not have, but the diameter of helix rib steel wire is between 6～10mm at present, can't go out spiral ribbed reinforced bar more than the output diameter 10mm according to its technology, therefore do not have the above spiral ribbed reinforced bar of 10mm in the market, cause the application blank of the spiral ribbed reinforced bar of the above diameter of 10mm.
Helix rib steel wire (being cold-drawn steel wire for prestressed concrete), its production technique be coil rod after steel mill is rolling by acid washing phosphorization then through drawing, carry out modifier treatment at last, wherein drawing is divided into 6 procedures again, preceding 5 roads are in order to improve the performance of helix rib steel wire, as hardness and intensity etc., the 6th procedure is to pull out the moulding spiral ribs through the spiral die drawing.Because its technology is subjected to the restriction of tooling device and engineering service requirements, only can produce 10mm, can not produce the reinforcing bar of big specification.
In addition, there are following shortcoming in existing this technology and the helix rib steel wire of producing thereof: improve intensity owing to carry out drawing earlier, carry out modifier treatment again, thereby make the ductility of helix rib steel wire relatively poor, strong flexor ratio is low; Owing to improve intensity by drawing, cause its lumber recovery low; Because mould often will change, and causes the production cost height; Because specification is too little, causes use range narrow; A large amount of spent acid that the acid washing phosphorization operation produces can't effectively be administered, serious environmental pollution; Continuous drawing all adopts many powerful drawing wire machinees, also serious waste the limited electric energy resource.
Because the spiral ribs of helix rib steel wire defective in shape own, thereby cause its another one shortcoming to be: can not realize between any two helix rib steel wires that nut is stubborn solid, namely can not two helix rib steel wires be threaded by nut, can only connect by ground tackle, increase link cost; And existing Deformed Steel Bars can be accomplished above this point, and this also is one of advantage of present Deformed Steel Bars.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the shortcoming of prior art, and a kind of high-strength spiral ribbed reinforced bar and working method thereof are provided, and has good anchoring property, and ductility is good, the strong flexor ratio height.
The technical scheme that the present invention solves above technical problem is:
A kind of high-strength spiral ribbed reinforced bar, its appearance has at least one continuous shape spiral ribs of one, comprise following component: C:0.25～0.4% by weight percentage, Si:0.1～0.2%, Mn:0.3～0.45%, Nb:0.04～0.05%, Cr:0.08～0.09%, V:0.01～0.04%, B:0.002～0.003%, Mo:0.001～0.003%, Al:0.015%～0.03%, S:0.002～0.003%, Ti:0.008%～0.009%, Ni:0.004%～0.005%, compound rare-earth: 3～5%, surplus is Fe.
The working method of high-strength spiral ribbed reinforced bar, carry out according to the following steps:
⑴ will smelt good reinforcing bar and send into process furnace and be heated to 1150～1250 ℃, be cooled fast to 700～750 ℃ through online refrigerating unit by pressurized air or vaporific hardening liquid then, then in quenching device water or hardening liquid carry out for the time quench for 15～25 seconds, be heated to 660～680 ℃ of tempering through the tempering process furnace then, arrive normal temperature by tempering refrigerating unit cooling process again;
⑵ be rolled into the surface with roll with reinforcing bar and have continuous shape spiral ribs, and hot-rolled temperature is 990～1150 ℃;
⑶ will be rolled into reinforcing bar that appearance has continuous shape spiral ribs and send into process furnace and be heated to 880～990, be cooled fast to 650～680 ℃ through online refrigerating unit by pressurized air or vaporific hardening liquid then, then in quenching device water or hardening liquid carry out for the time quench for 15～25 seconds, be heated to 500～550 ℃ of tempering through the tempering process furnace then, arrive normal temperature by tempering refrigerating unit cooling process again.
Because twice different thermal treatment process before and after working method of the present invention adopts, thermal treatment for the first time can make the performance that does not have hot rolling reinforcing bar before to obtain conveniently to be rolled into continuous shape spiral ribs: strength grade is at 600～770Mpa, about strong flexor ratio 1.13, metallographic structure is to be made up of ferrite and martensitic stucture; Thermal treatment for the second time then is used for improving to have the performance of continuous shape spiral ribbed reinforced bar: strength grade is at 1000～1570Mpa, and strong flexor ratio is greater than more than 1.15, and metallographic structure is to be made up of ferrite, sorbite and troostitic structures.
The technical scheme that the present invention further limits is:
Aforesaid high-strength spiral ribbed reinforced bar in the compound rare-earth, comprises following component: La:25～35% by weight percentage, Ce:15～20%, Y:5～8%, Sc:7～12%, Gd:3～5%, Sm:5～7%, Dy:3～5%, Pr:10～20%.By increasing compound rare-earth, can be convenient to reinforcing bar is rolled into continuous shape spiral ribs on the one hand, and improved the performance of reinforcing bar on the other hand: high ductility and high strong flexor ratio, ductility are higher than helix rib steel wire 30～50% well, and strong flexor ratio is higher than helix rib steel wire 15～20%.
Aforesaid high-strength spiral ribbed reinforced bar, it is 90 °～95 ° that two tangent tangent lines of each bar continuous shape spiral ribs dual-side and rebar surface form angle.
Aforesaid high-strength spiral ribbed reinforced bar, the width of the continuous shape spiral ribs of each bar is 3～3.5mm, highly is 0.5～0.9mm.
The working method of aforesaid high-strength spiral ribbed reinforced bar, roll comprises following component: C:0.35～0.45% by weight percentage, Mn:0.25～0.35%, Si:0.15～0.25%, Cr:2.15～3. 05%, Mo:0.05～0.08%, Al:0.012～0.014%, all the other are Fe and unavoidable impurities;
Roll need carry out following surface treatment: 1. heating: Heating temperature is 770～790 ℃; 2. cooling: be cooled to 500～700 ℃ with 5～10 ℃/s cooling rate; 3. quench: water or hardening liquid carry out 15～25 seconds quenching in quenching device; 4. tempering: tempering temperature is 600～630 ℃.
After using the above roll and surface treatment that becomes to be grouped into, fine carbide is separated out in becoming martensitic matrix fully in a large number, form the high tissue of hardness, roll hardness is bigger slightly than the reinforcing bar of hot rolling required for the present invention, strength grade easily form continuous shape spiral ribs in the hot rolling of reinforcing bar surface, but hardness can not be excessive at 900～1000Mpa, the too big damage easily of hardness reinforcing bar body, the hot rolling lumber recovery is lower.Therefore, select the roll of above composition for use, hardness is suitable, but hot rolling goes out continuous shape spiral ribs required for the present invention.
The working method of spiral ribbed reinforced bar of the present invention can be produced the spiral ribbed reinforced bar of all size, comprises specification and the above big specification of 50mm between appointing among 6～50mm; By different thermal treatment process, not only can produce the prestressed spiral rib steel muscle, can also produce high-strength spiral ribbed reinforced bar.
Spiral ribbed reinforced bar of the present invention has the good anchoring property of the advantage that helix rib steel wire has: ⑴, and the salient rib of shape makes the continuous concave-convex clutch tooth of formation between reinforcing bar and concrete continuously, thereby reaches desirable anchoring effect; ⑵ bar cross section is long-pending without any loss, and the entire body cross section equates; ⑶ spiral ribs appearance is more reasonable, and spiral ribs is continuous on the one hand, and the long-pending weakening of basal plane is less, and the flank area still can bear pulling force; Spiral ribbed reinforced bar has the better anchoring strength and stiffness on the other hand, and still has than large bearing capacity (anchoring ductility is good) during big slippage, is conducive to antidetonation; ⑷ many spiral ribs of spiral ribbed reinforced bar rat, the concrete tooth engaged is generous and uninterrupted continuously, is difficult for fragmentation, cuts off; Squish area is big, and relatively finned surface is long-pending big, and splitting power is evenly non-directional, has better anchoring ductility during little and later stage of therefore early stage slippage gross distortion.
The spiral ribbed reinforced bar that explained hereafter of the present invention goes out not only has above advantage, and also have present helix rib steel wire and following advantage that Deformed Steel Bars did not have: ⑴ ductility is good, is higher than helix rib steel wire 30～50%; ⑵ strong flexor ratio height is higher than helix rib steel wire 15～20%; ⑶ have present Deformed Steel Bars can twist solid characteristics by nut, combines both great advantage, reduces ground tackle and becomes, and reduces by 80% link cost; And concretely reach the 100%(Deformed Steel Bars in conjunction with useful area and will lose about 6%-11%); ⑸ improved reinforcing bar and concrete bond stress and bonding force, lengthened prestressed transmission length, reduced prestressed loss power simultaneously; ⑹ improved at least 30% safety coefficient, and wherein 15-20% improves generation by its ductility and strong flexor ratio, and 10-20% is by its generation that is threaded.
Technology of the present invention has the following advantages: ⑴ need not use hydrochloric acid or sulfuric acid to carry out pickling and phosphatization, benefits environmental protection; ⑵ adopt on-line continuous air cooling and quenching technology technology, can make the product strength grade at 600～1570Mpa, and elongation is greater than more than 10%, and strong flexor ratio is greater than more than 1.15, elongation height, intensity height; ⑶ the strength grade of the on-line continuous air cooling Technology that adopt is at 600～900Mpa, metallographic structure is to be made up of ferrite, martensite, a small amount of bainite structure, wherein ferrite is evenly distributed in martensite and the bainite structure, the strength grade of the quenching technology technology that adopts is at 1000～1570Mpa, and metallographic structure is to be made up of ferrite, sorbite and troostitic structures; ⑷ roll adopts serpentine two-way system groove, has realized the seamless link between the rebar surface spiral, does not have vertical convex tendon, and its basic circle area occupation ratio is 1.0, has strengthened and concrete cohesive force, prevents concrete splitting phenomenon under strained condition.
Description of drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is the sectional view of Fig. 1.
Embodiment
Present embodiment proposes a kind of high-strength spiral ribbed reinforced bar, structure is shown in 1, two spiral ribs 2 that comprise reinforcing bar body 1 and reinforcing bar surface, spiral ribs 2 is continuous distribution in the reinforcing bar surface, it is 90 ° that two tangent tangent lines of continuous shape spiral ribs 2 dual-sides of each bar and rebar surface form angle, the width of the continuous shape spiral ribs of each bar is 3mm, highly is 0.5mm.
The high-strength spiral ribbed reinforced bar of present embodiment comprises following component: C:0.25%, Si:0.1% by weight percentage, Mn:0.3%, Nb:0.04%, Cr:0.08%, V:0.01%, B:0.002%, Mo:0.001%, Al:0.015%, S:0.002%, Ti:0.008%, Ni:0.004%, compound rare-earth: 3%, surplus is Fe.In the compound rare-earth, comprise following component: La:25% by weight percentage, Ce:20%, Y:8%, Sc:12%, Gd:5%, Sm:5%, Dy:5%, Pr:20%.
The working method of high-strength spiral ribbed reinforced bar, carry out according to the following steps:
⑴ will smelt good reinforcing bar and send into process furnace and be heated to 1150 ℃, be cooled fast to 700 ℃ through online refrigerating unit by pressurized air or vaporific hardening liquid then, then in quenching device water or hardening liquid carry out for the time quench for 15 seconds, be heated to 660 ℃ of tempering through the tempering process furnace then, arrive normal temperature by tempering refrigerating unit cooling process again.
⑵ be rolled into the surface with roll with reinforcing bar and have continuous shape spiral ribs, and hot-rolled temperature is 990 ℃, and roll comprises following component: C:0.35% by weight percentage, Mn:0.25%, Si:0.15%, Cr:2.15%, Mo:0.05%, Al:0.012%, all the other are Fe and unavoidable impurities; Roll need carry out following surface treatment: 1. heating: Heating temperature is 770 ℃; 2. cooling: be cooled to 500 ℃ with 5 ℃/s cooling rate; 3. quench: water or hardening liquid carry out 15 seconds quenching in quenching device; 4. tempering: tempering temperature is 600 ℃;
⑶ will be rolled into reinforcing bar that appearance has continuous shape spiral ribs and send into process furnace and be heated to 880 ℃, be cooled fast to 650 ℃ through online refrigerating unit by pressurized air or vaporific hardening liquid then, then in quenching device water or hardening liquid carry out for the time quench for 15 seconds, be heated to 500 ℃ of tempering through the tempering process furnace then, arrive normal temperature by tempering refrigerating unit cooling process again.
Present embodiment proposes a kind of high-strength spiral ribbed reinforced bar, structure is shown in 1, two spiral ribs 2 that comprise reinforcing bar body 1 and reinforcing bar surface, spiral ribs 2 is continuous distribution in the reinforcing bar surface, it is 92 ° that two tangent tangent lines of continuous shape spiral ribs 2 dual-sides of each bar and rebar surface form angle, the width of the continuous shape spiral ribs of each bar is 3.3mm, highly is 0.7mm.
The high-strength spiral ribbed reinforced bar of present embodiment comprises following component: C:0.3%, Si:0.15% by weight percentage, Mn:0.4%, Nb:0.045%, Cr:0.085%, V:0.03 %, B:0.0025%, Mo:0.002%, Al:0.025%, S:0.0025%, Ti:0.0085%, Ni:0.0045%, compound rare-earth: 4%, surplus is Fe.In the compound rare-earth, comprise following component: La:33% by weight percentage, Ce:17%, Y:5%, Sc:10%, Gd:5%, Sm:7%, Dy:3%, Pr:20%.
The working method of high-strength spiral ribbed reinforced bar, carry out according to the following steps:
⑴ will smelt good reinforcing bar and send into process furnace and be heated to 1200 ℃, be cooled fast to 720 ℃ through online refrigerating unit by pressurized air or vaporific hardening liquid then, then in quenching device water or hardening liquid carry out for the time quench for 20 seconds, be heated to 670 ℃ of tempering through the tempering process furnace then, arrive normal temperature by tempering refrigerating unit cooling process again.
⑵ be rolled into the surface with roll with reinforcing bar and have continuous shape spiral ribs, and hot-rolled temperature is 1100 ℃, and roll comprises following component: C:0.40% by weight percentage, Mn:0.30%, Si:0.20%, Cr:2.85%, Mo:0.07%, Al:0.013%, all the other are Fe and unavoidable impurities; Roll need carry out following surface treatment: 1. heating: Heating temperature is 780 ℃; 2. cooling: be cooled to 600 ℃ with 8 ℃/s cooling rate; 3. quench: water or hardening liquid carry out 20 seconds quenching in quenching device; 4. tempering: tempering temperature is 610 ℃;
⑶ will be rolled into reinforcing bar that appearance has continuous shape spiral ribs and send into process furnace and be heated to 900 ℃, be cooled fast to 660 ℃ through online refrigerating unit by pressurized air or vaporific hardening liquid then, then in quenching device water or hardening liquid carry out for the time quench for 20 seconds, be heated to 530 ℃ of tempering through the tempering process furnace then, arrive normal temperature by tempering refrigerating unit cooling process again.
Embodiment 3
Present embodiment proposes a kind of high-strength spiral ribbed reinforced bar, structure is shown in 1, two spiral ribs 2 that comprise reinforcing bar body 1 and reinforcing bar surface, spiral ribs 2 is continuous distribution in the reinforcing bar surface, it is 95 ° that two tangent tangent lines of continuous shape spiral ribs 2 dual-sides of each bar and rebar surface form angle, the width of the continuous shape spiral ribs of each bar is 3.5mm, highly is 0.9mm.
The high-strength spiral ribbed reinforced bar of present embodiment comprises following component: C:0.4%, Si:0.2% by weight percentage, Mn:0.45%, Nb:0.05%, Cr:0.09%, V:0.04 %, B:0.003%, Mo:0.003%, Al:0.03%, S:0.003%, Ti:0.009%, Ni:0.005%, compound rare-earth: 5%, surplus is Fe.In the compound rare-earth, comprise following component: La:35% by weight percentage, Ce:15%, Y:7%, Sc:11%, Gd:4%, Sm:6%, Dy:4%, Pr:18%.
The working method of high-strength spiral ribbed reinforced bar, carry out according to the following steps:
⑴ will smelt good reinforcing bar and send into process furnace and be heated to 1250 ℃, be cooled fast to 750 ℃ through online refrigerating unit by pressurized air or vaporific hardening liquid then, then in quenching device water or hardening liquid carry out for the time quench for 25 seconds, be heated to 680 ℃ of tempering through the tempering process furnace then, arrive normal temperature by tempering refrigerating unit cooling process again.
⑵ be rolled into the surface with roll with reinforcing bar and have continuous shape spiral ribs, and hot-rolled temperature is 1150 ℃, and roll comprises following component: C:0.45% by weight percentage, Mn:0.35%, Si:0.25%, Cr:3. 05%, Mo:0.08%, Al:0.014%, all the other are Fe and unavoidable impurities; Roll need carry out following surface treatment: 1. heating: Heating temperature is 790 ℃; 2. cooling: be cooled to 700 ℃ with 10 ℃/s cooling rate; 3. quench: water or hardening liquid carry out 25 seconds quenching in quenching device; 4. tempering: tempering temperature is 630 ℃;
⑶ will be rolled into reinforcing bar that appearance has continuous shape spiral ribs and send into process furnace and be heated to 990 ℃, be cooled fast to 680 ℃ through online refrigerating unit by pressurized air or vaporific hardening liquid then, then in quenching device water or hardening liquid carry out for the time quench for 25 seconds, be heated to 550 ℃ of tempering through the tempering process furnace then, arrive normal temperature by tempering refrigerating unit cooling process again.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (4)
1. high-strength spiral ribbed reinforced bar, its appearance has at least one continuous shape spiral ribs of one, it is characterized in that: comprise following component: C:0.25～0.4% by weight percentage, Si:0.1～0.2%, Mn:0.3～0.45%, Nb:0.04～0.05%, Cr:0.08～0.09%, V:0.01～0.04%, B:0.002～0.003%, Mo:0.001～0.003%, Al:0.015%～0.03%, S:0.002～0.003%, Ti:0.008%～0.009%, Ni:0.004%～0.005%, compound rare-earth: 3～5%, surplus is Fe;
In the described compound rare-earth, comprise following component: La:25～35% by weight percentage, Ce:15～20%, Y:5～8%, Sc:7～12%, Gd:3～5%, Sm:5～7%, Dy:3～5%, Pr:10～20%.
2. high-strength spiral ribbed reinforced bar as claimed in claim 1 is characterized in that: it is 90 °～95 ° that two tangent tangent lines of described each bar continuous shape spiral ribs dual-side and rebar surface form angles.
3. high-strength spiral ribbed reinforced bar as claimed in claim 1, it is characterized in that: the width of the continuous shape spiral ribs of described each bar is 3～3.5mm, highly is 0.5～0.9mm.
4. the working method of high-strength spiral ribbed reinforced bar according to claim 1 is characterized in that: carry out according to the following steps:
⑴ will smelt good reinforcing bar and send into process furnace and be heated to 1150～1250 ℃, be cooled fast to 700～750 ℃ through online refrigerating unit by pressurized air or vaporific hardening liquid then, then in quenching device water or hardening liquid carry out for the time quench for 15～25 seconds, be heated to 660～680 ℃ of tempering through the tempering process furnace then, arrive normal temperature by tempering refrigerating unit cooling process again;
⑵ be rolled into the surface with roll with reinforcing bar and have continuous shape spiral ribs, and hot-rolled temperature is 990～1150 ℃;
⑶ will be rolled into reinforcing bar that appearance has continuous shape spiral ribs and send into process furnace and be heated to 880～990 ℃, be cooled fast to 650～680 ℃ through online refrigerating unit by pressurized air or vaporific hardening liquid then, then in quenching device water or hardening liquid carry out for the time quench for 15～25 seconds, be heated to 500～550 ℃ of tempering through the tempering process furnace then, arrive normal temperature by tempering refrigerating unit cooling process again;
Described roll comprises following component: C:0.35～0.45% by weight percentage, Mn:0.25～0.35%, and Si:0.15～0.25%, Cr:2.15～3. 05%, Mo:0.05～0.08%, Al:0.012～0.014%, all the other are Fe and unavoidable impurities;
Described roll need carry out following surface treatment:
Heating: Heating temperature is 770～790 ℃;
Cooling: be cooled to 500～700 ℃ with 5～10 ℃/s cooling rate;
Quench: water or hardening liquid carry out 15～25 seconds quenching in quenching device;
Tempering: tempering temperature is 600～630 ℃.
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