CN109731932A - A kind of anti-red rust method of reinforcing bar - Google Patents

Abstract

The invention discloses a kind of anti-red rust method of reinforcing bar, the method is specific as follows: step 1: anti-red rust steel billet ingredient, the steel billet component includes C:0.20 ~ 0.25%, Si:0.35 ~ 0.65%, Mn:0.80 ~ 1.15%, P≤0.040%, S≤0.040%, surplus are Fe and inevitable impurity；Step 2: adjustment dephosphorizing machine pressure is set as 7MPa or more, determines that steel billet dephosphorization reaches surface layer non-oxidation iron sheet；Step 3: wearing hydrophone and be successively arranged according to cooling nozzles, water resistance blowback, nitrogen purging and 5m nitrogen protection；Step 4: laying temperature according to 760 ~ 780 DEG C, after spinning according to intensity of cooling by strong to weak, 500 DEG C or less are reduced in 45s.The anti-red rust method of reinforcing bar of the invention solves the problems, such as oxide layer red rust on steel surface or rolling mill practice processing, and effectively realizes that steel store corrosion problem for a long time.

Description

A kind of anti-red rust method of reinforcing bar

Technical field

The present invention relates to a steel bar meter method methods, and in particular to a kind of anti-red rust method of reinforcing bar, belong to reinforcing bar prevent it is red Rust technical field.

Background technique

Steel market dog-eat-dog at present, requirement of the user to surface quality of steel is also higher and higher, the attachment of valve snail surface Red rust can seriously affect the quality and occupation rate of market for receiving ability product, while storing, drenching with rain and moist for a long time with steel Under environment, surface red rust can cause product storage rear surface corrosion serious, further influence product gradually to steel internal corrosion Quality, research has shown that since iron scale is broken in the operation of rolling, the just aerial particle of exposure increases, to increase Bronzing is presented in the extent of reaction of Fe0-Fe3O4- Fe2O3, final product, and the major temperature section of red rust concentrates on 720-860 Between DEG C, due to the continuous popularization of third generation TMCP technology, the finish to gauge laying temperature of each steel mill valve snail constantly reduces to realize The reduction of cost of alloy, and how the generation of red rust to be avoided to become what industry was generally acknowledged in the case where reducing laying temperature and producing Problem；The existing anti-red rust method of reinforcing bar is fewer, such as Chinese Patent Application No.: 201410835811.3, disclose a kind of use In the spray vaporization cooling device and method of hot-rolled high-strength reinforcing bar, including water and air supply system, spray vaporization cooling device six Section, infrared radiation thermometer and computer operating system；Wherein, gas supply water system by water-main, filter screen, gas main, air accumulator, Vavle shelf system, water supplying pipe and air supply pipe composition.Each pressure gauge and flowmeter of vavle shelf system will supply water respectively and the pressure of gas supply Computer operating system is sent to by far distance instrument signal with flow parameter.Water for hot-rolled high-strength reinforcing bar of the invention Mist apparatus for vapour-cooling accelerates the type of cooling by the staged of spray vaporization cooling nozzles packet segmentation, controls crystal grain refinement Hot-rolled reinforced bar is significantly improved under the premise of avoiding traditional Water cooling from leading to the formation of martensite ring with bainite transformation Intensity, and required elongation, strong flexor ratio and anti-seismic performance are obtained, alloy content and new water consumption are reduced, is prevented simultaneously The generation of rebar surface red rust caused by Water cooling is stopped；But steel billet outer surface compactness is not good enough, in addition, its integrated artistic It is unfavorable for anti-red rust.

Summary of the invention

To solve the above problems, the invention proposes a kind of anti-red rust methods of reinforcing bar, at steel surface or rolling mill practice In reason, oxide layer red rust is solved the problems, such as, and effectively realize that steel store corrosion problem for a long time.

The anti-red rust method of reinforcing bar of the invention, the method are specific as follows:

Step 1: anti-red rust steel billet ingredient, the steel billet component include C:0.20 ~ 0.25%, and Si:0.35 ~ 0.65%, Mn:0.80 ~ 1.15%, P≤0.040%, S≤0.040%, surplus are Fe and inevitable impurity；By improving surface optimization Si element, promote Cooling procedure is set to form dense oxide tissue.

Step 2: adjustment dephosphorizing machine pressure is set as 7MPa or more, determines that steel billet dephosphorization reaches surface layer non-oxidation iron sheet；

Step 3: wearing hydrophone and be successively arranged according to cooling nozzles, water resistance blowback, nitrogen purging and 5m nitrogen protection；

Step 4: laying temperature according to 760 ~ 780 DEG C, after spinning according to intensity of cooling by strong to weak, 500 DEG C are reduced in 45s Below.

As preferred embodiment, the steel billet component includes C:0.20%, Si:0.40%, Mn:1.00%, and P≤ 0.040%, S≤0.040%, surplus are Fe and inevitable impurity；

As preferred embodiment, the steel billet component includes C:0.23%, Si:0.50%, Mn:1.00%, P≤0.040%, S ≤ 0.040%, surplus is Fe and inevitable impurity；

As preferred embodiment, the steel billet component includes C:0.25%, Si:0.65%, Mn:1.15%, P≤0.040%, S ≤ 0.040%, surplus is Fe and inevitable impurity.

The present invention compared with prior art, the anti-red rust method of reinforcing bar of the invention；Connect in strict accordance with molten iron-converter-LF- Casting-heating-rolling is produced, and on steel surface or rolling mill practice processing, solves the problems, such as oxide layer red rust, and effectively realize Steel store corrosion problem for a long time；The generation that steel red rust is prevented by technology controlling and process, has reinforcing bar in production technology TMCP controlled rolling and controlled cooling condition is controlled according to 760 ~ 780 DEG C of laying temperature, steel mechanics performance can be improved, to reduce Cost of alloy.

Specific embodiment

The anti-red rust method of reinforcing bar of the invention, the method are specific as follows:

Step 1: titanium nitride alloying ingredient, the nitridation titanium alloy component includes Si:17-20%, Mn:2-5%, N:10-20%, Ti: 20-30%, surplus are Fe and inevitable impurity；The nitridation titanium alloy carries out packaging with every packet 10kg and forms titanium nitride conjunction Jin Bao；

Step 2: the control standard of composite alloy ingredient: C:0.22-0.25%, Si:0.60-0.80%, Mn:1.40-1.60%, P: ≤ 0.045%, S :≤0.045%, V:0.005-0.010%, Ti: >=0.010%, Ceq :≤0.54%；Surplus is for Fe and unavoidably Impurity；

Step 3: composite alloy processing:

(1) converter procedure: converter procedure not killing directlys adopt silicomanganese, ferrosilicon, VN alloy and carries out alloying, tapping It finishes and the top 600Kg debris ash is added；Bottom-blowing of converter, converter ladle bottom blowing are all made of nitrogen；

(2) refining procedure: refining ladle bottom blowing whole process is added in refining furnace after using argon gas, molten steel to enter the station and nitrogenizes titanium alloy 0.8Kg/t, when nitridation titanium alloy packet is added must whole packet be added, oxygen is determined in energization temperature raising, then fine tuning carbon, silicon, manganese, vanadium, titanium at Part, calcium line 150m, 4 ~ 5m/s of feeding wire speed, soft blow 5min are fed after composition is qualified.

(3) continuous casting working procedure: 1503 DEG C of steel grade liquidus temperature, Con casting ladle to middle packet is poured using the protection of big packet long nozzle Note, middle packet liquid level use alkaline covering agent and charring rice husk, and middle packet to crystallizer is poured using submersed nozzle and protection flux shielding Note, 1525 ~ 1535 DEG C of tundish temperature when conticaster flows casting entirely, 3.2 ~ 3.5m/min of pulling rate, not more than 3.5m/min； The selection of nitridation titanium alloy prepares, converter, refining, continuous casting working procedure operate in the control range and smelting process of alloying component The formulation of main points；The selection of the nitridation titanium alloy mainly nitrogenizes the requirement of titanium alloy component, the control of the alloying component Range is the control standard of final steel water alloying component, converter in the smelting process, refining, continuous casting working procedure key points for operation system Surely refer to that the determination on opportunity and additional amount is added in alloy；This V-Ti composite alloy strengthens new technology, can pass through the compound conjunction of V-Ti Gold is strengthened, and while meeting steel performance, cost of implementation is optimal.

In another embodiment, the nitridation titanium alloy component includes Si:17%, Mn:2%, N:10%, Ti:20%, surplus Fe With inevitable impurity；The nitridation titanium alloy carries out packaging with every packet 10kg and forms nitridation titanium alloy packet.

In another embodiment, the nitridation titanium alloy component includes Si:18%, Mn:4%, N:15%, Ti:25%, surplus Fe With inevitable impurity；The nitridation titanium alloy carries out packaging with every packet 10kg and forms nitridation titanium alloy packet；

In another embodiment, the nitridation titanium alloy component includes Si:20%, Mn:5%, N:20%, Ti:30%, surplus be Fe and Inevitable impurity；The nitridation titanium alloy carries out packaging with every packet 10kg and forms nitridation titanium alloy packet.

Above-described embodiment is only better embodiment of the invention, therefore all according to structure described in present patent application range It makes, the equivalent change or modification that feature and principle are done, is included in the scope of the patent application of the present invention.

Claims (4)

1. a kind of anti-red rust method of reinforcing bar, it is characterised in that: the method is specific as follows:

Step 1: anti-red rust steel billet ingredient, the steel billet component include C:0.20 ~ 0.25%, and Si:0.35 ~ 0.65%, Mn:0.80 ~ 1.15%, P≤0.040%, S≤0.040%, surplus are Fe and inevitable impurity；

Step 2: adjustment dephosphorizing machine pressure is set as 7MPa or more, determines that steel billet dephosphorization reaches surface layer non-oxidation iron sheet；

Step 3: wearing hydrophone and be successively arranged according to cooling nozzles, water resistance blowback, nitrogen purging and 5m nitrogen protection；

Step 4: laying temperature according to 760 ~ 780 DEG C, after spinning according to intensity of cooling by strong to weak, 500 DEG C are reduced in 45s Below.

2. the anti-red rust method of reinforcing bar according to claim 1, it is characterised in that: the steel billet component includes C:0.20%, Si:0.40%, Mn:1.00%, P≤0.040%, S≤0.040%, surplus are Fe and inevitable impurity；

3. the anti-red rust method of reinforcing bar according to claim 1, it is characterised in that: the steel billet component includes C:0.23%, Si:0.50%, Mn:1.00%, P≤0.040%, S≤0.040%, surplus are Fe and inevitable impurity；

4. the anti-red rust method of reinforcing bar according to claim 1, it is characterised in that: the steel billet component includes C:0.25%, Si:0.65%, Mn:1.15%, P≤0.040%, S≤0.040%, surplus are Fe and inevitable impurity.