Production process of high-efficiency Q235B micro-titanized steel grade

A Q235B, production process technology, applied in the field of high-efficiency Q235B micro-titanium steel production process, can solve the problems of low cost and high efficiency, unable to meet the cold bending process, etc., to increase the continuous casting casting speed, improve internal quality, Effect of reducing crack susceptibility

Active Publication Date: 2022-02-08
武安市裕华钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention proposes a high-efficiency Q235B micro-titanium steel production process, which solves the problem in

Method used

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  • Production process of high-efficiency Q235B micro-titanized steel grade
  • Production process of high-efficiency Q235B micro-titanized steel grade

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Composition: C: 0.06%, Si: 0.06%, Mn: 0.40%, P: 0.025%, S: 0.020%, Als: 0.020%, Ti: 0.040%, the balance is Fe.

[0037] Routing: Mixer ladle or furnace off tank → → → argon deoxygenated alloy slab caster Station → → → heating the slab in the rough rolling → cropping and pre-finishing rolling → → truncated finishing train cooled rolling → → → roll bale collector, identified, weighed, test volume → storage → unloading.

[0038] When steel converter 1min, into lime 2kg / t, desulfurizing agent 5kg / t, wherein the desulfurizing agent comprises the following components: CaO: 51%, SiO 2 : 4%, Al 2 O 3 : 30%, Al: 12%, CaF 2 : 3%.

[0039] When opening the converter steel ladle bottom blowing argon, and the control flow 300-350L / min, argon time 12min. Wherein the tapping time control 4min.

[0040] The deoxidation alloy target composition, adding titanium iron alloy according to conventional methods.

[0041]When the argon station is refined, the feed point is located directly a...

Embodiment 2

[0044] Composition: C: 0.05%, Si: 0.07%, Mn: 0.45%, P: 0.022%, S: 0.018%, ALS: 0.027%, Ti: 0.035%, the margin is Fe.

[0045] Process route: mixed iron or iron bag fuel tank → converter → deoxidation alloying (according to the composition) → Blowing argon station → slab coils → slab heating → Rolled rolled head tail → medium rolling head → Pre-precision rolling → Fabric rolling unit rolling → water cooling → set roll → bundle, logo, weigh, inspection → unloading roll → in the library.

[0046] When the converter is 1.2min, the white gray is 2.3kg / t, the desulfurizer is 4.8kg / t, wherein the desulfurizer comprises the following components: CAO: 55%, SiO 2 : 4%, Al 2 O 3 : 25%, Al: 14%, CAF 2 :2%.

[0047] When the converter is turned on, the steel packet is opened, and the control flow is 350-400 L / min, and the argon is blown for 10 min. Among them, the steel time is controlled for 5 min.

[0048] The deoxygenation is composed of the target, and the titanium iron alloy is adde...

Embodiment 3

[0052] Composition: C: 0.06%, Si: 0.06%, Mn: 0.50%, P: 0.024%, S: 0.015%, ALS: 0.015%, Ti: 0.030%, the margin is Fe.

[0053] Process route: mixed iron or iron bag flex → converter → deoxidation alloy → blow argon station → slab coating machine → slab heating → thick rolling head tail → medium rolling head → Pre-precision rolling → finishing mill Rolling → water cooling → Set roll → bundle, logo, weigh, inspection → unloading roll → in the library.

[0054] When the converter is fired for 1 min, the white ash is 2.5kg / t, the desulfurizer is 5.5kg / t, wherein the desulfurizer comprises the following components: CAO: 60%, SiO 2 : 3%, Al 2 O 3 : 21%, Al: 15%, CAF 2 :1%.

[0055] When the converter is turned out, the steel packet is opened and the bottom is blown, and the flow rate is controlled at 400-450 l / min, and the argon is blown for 8 min. Among them, the steel time is controlled for 4 minutes.

[0056] The deoxygenation is composed of the target, and the titanium iron all...

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Abstract

The invention relates to the technical field of steelmaking processes, and in particular relates to a high-efficiency Q235B micro-titanized steel grade. The steel grade is composed of, by weight, 0.04% to 0.07% of C, smaller than or equal to 0.10% of Si, 0.35% to 0.55% of Mn, smaller than or equal to 0.040% of P, smaller than or equal to 0.035% of S, 0.010% to 0.050% of Als, 0.030% to 0.050% of Ti and the balance Fe. The invention provides a production process of the high-efficiency Q235B micro-titanized steel grade. Desulfurization and calcium treatment process are carried out by adding titanium to reduce carbon and "slag washing" after converter furnace, low-superheat-degree casting is adopted in the continuous casting process, the influence of sulfide in steel and a finished product banded structure on the product and performance is reduced, and the cold bending process requirements of customers are met.

Description

Technical field [0001] The present invention relates to the technical field of steelmaking technology, particularly, it relates to a high efficiency micro Q235B titanium steel production process. Background technique [0002] Q235B certain elongation, strength, toughness and good castability, easy stamping and welding, widely used for general manufacturing mechanical parts. Mainly used for construction, the bridge engineering requirements of high quality welded structure. General chemical composition of C: 0.14% -0.18%, Si: ≤0.3%, Mn: 0.4% -0.6%. [0003] Q235B commonly used as ordinary carbon steel, on the strength, plasticity, weldability and DBTT has certain requirements. To ensure Q235B steel bending process while meeting customer requirements, most steel mills to take "too refined" production process, this process increases the cost, but also cause excessive quality. Conventional control Q235B carbon content of 0.14% -0.18%, cracks in sensitive areas prone to surface defects...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14C21C7/00C21C7/06C21C7/064C21C7/072C22C33/04
CPCC22C38/02C22C38/04C22C38/06C22C38/14C22C33/04C21C7/0006C21C7/06C21C7/064C21C7/072Y02P10/20
Inventor 任志鑫李洪波赵亚飞孟凡超高振伟李世伟孙晶磊
Owner 武安市裕华钢铁有限公司
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