TW200825188A - Steel, and processing method for the production of higher-strength fracture-splittable machine components - Google Patents

Abstract

The invention relates to a steel and a processing method for higher-strength fracture-splittable machine components that are composed of at least two fracture-splittable parts. Said steel and method are characterized in that the chemical composition of the steel (expressed in percent by weight) is as follows: 0.40% ≤ C ≤ 0.60%; 0.20% ≤ Si ≤ 1.00%; 0.50% ≤Mn ≤ 1.50%; 0% ≤ Cr ≤ 1.00%; 0% ≤ Ni ≤ 0.50%; 0% ≤ Mo ≤ 0.20%; 0% ≤ Nb ≤ 0.050%; 0% ≤ V0 ≤.30%; 0% ≤ Al ≤ 0.05%; 0% ≤ N ≤ 0.020%, the rest being composed of iron and smelting-related impurities and residual matter.

Description

200825188 IX. DESCRIPTION OF THE INVENTION: TECHNICAL FIELD OF THE INVENTION The present invention relates to a steel and a processing method for manufacturing a high strength fracture-separable mechanical component. This material is for example the developer of a crackpleuel. [Prior Art] This steel shall be suitable for forging or other thermal deformation, by forging temperature • (Sehmiedehitze) using controlled cooling _ a whole wave of iron structure with an extension limit of more than 750 N/mm 2 and tensile strength of 1〇 〇〇~12〇〇N/mm 2 , the tensile elongation is more than 1〇%, and the area reduction after crushing (Brucheinschnurung, ^: after-fracture area reduction) exceeds 25%, and it is particularly important to be suitable for fracture separation. The nature of this desired property can be achieved by a kind of Borne iron structure, which has a special carbide (S〇ndercarbid) (carbonized strontium carbide and vanadium carbide) and manganese sulphide. The adjusted chemical composition is precipitated, and is achieved during the thermal deformation of the prior material and at the control temperature of the component completion pressure (熬 mechanical treatment), and the heat treatment after the forging or thermal deformation is completed. To date, for this purpose of use, for example, it is used according to the buyer's engineering specifications to have about 0.7% c, 0.5 to 0.9% Mn, 0.06 to 0.07% S, and 〇·1 to 0.2% V (C70S6, 70MnVS4). It has an average carbon content of about 0.4% C, about 1% M, 〇.〇6 〇.〇7% s, and about 0.3% V (36MnVS4), which is composed of eutektoid. 200825188 These steels have a kind of Borneo structure, which has a hunger and a melon clock, and is pre-returned on mechanical temporarys. The shortcoming of this conventional material technology is that it has been hitherto by the material technology! : There is a great resource consumption on the expensive and scarce alloying agent. In particular, the county Θ 疋 疋 疋 疋 则 更大 则 则 析 析 析 析 析 析 析 析 析 析 析 析 析 析 析 析 析 析 析 析 析 析 析 析 析 析 析 析 更大 更大 更大 更大In this way, hunger is a material that is missing. Only [invention content]

This novel steel can be manufactured in a ressourcenschonend, and the object of the invention is to avoid the above disadvantages with a new steel. It has the required mechanical properties for strength (and long-term strength surface, in addition to good toughness in tensile tests, and good crackability) for continuous casting and forging. It is more resource-saving with steel. It replaces the hunger content with hydrazine, using a corresponding deformation and cooling strategy. The value of the large elongation limit, in addition to the basic chemical composition, is the use of the stagnation and hunger to form special specialties. The distribution is achieved by the precipitation of the finest carbide as much as possible. For this reason, in the last 埶辔 belt half _ this ^ Λ ^ π take the instrument w , , , , the text step w, the existing carbide needs to be melted ( AufH3 still g) 'and control the temperature process during thermal deformation and subsequent cooling, finely distributed precipitation (4) can be achieved at a low final deformation temperature and then slightly accelerated cooling. So 'in particular, the extension limit can be improved, and Therefore, the ratio of the stretching limit can be greatly improved. [Embodiment] 6 200825188 The tensile strength can also be a basic value (which consists of the basic composition: 0.5% C, 0.6% Si, 1.0% Mn, 0.23% Cr, 0.2% Ni). And 0.1 4% V means) after the thermal deformation, the cooling is slightly accelerated and adjusted within the desired range. The value of the edge is particularly limited according to the standard strontium·〇6~0.07% sulfur. In this respect, the carbon content is higher. The nitrogen content has the same positive effect. It is important for the material to be cracked (Crackbarkeit) to be a crystallization failure without a giant vision. This is due to the high carbon, nitrogen, sulfur content and lower chromium content. Conceptual presupposition of nickel and molybdenum blending.

«η According to this solution, the present invention relates to a steel for manufacturing a split-separable member of the automobile industry, having the following chemical composition: 0.40% < C < 0.60% 0.20% < Si < 1.00% 0.50 % < Μη < 1.50% 〇% < Cr < 1.00% 〇% < Ni < 0.50% 〇% < Mo < 0.20% 〇% < Nb < 0.050% 〇% < V &lt ; 0.30% 〇% < A1 < 0.05% 〇% < N < 0.020%

Among them, the composition. The remainder of C is affected by iron and impurities and residues of the prior art. 7 200825188 0.29% V (in part • alloy cost addition (LZ) due to 36MnVS4). • There are few other ways to replace the patented steel quality. [Advantages of this novel technology] • The alloy cost is low (only 〇14%V). • The buyer is not affected by some favorable steel quality. [Simple description of the map]

[Main component symbol description] None

Claims (1)

200825188 X. Patent application scope: 1. A steel for manufacturing high strength fracture-separable mechanical components, characterized in that its chemical composition has the following composition (% by weight) · 0.40% < C < 0.60% 0.20 % < Si < 1.00% 0.50% < Μη < 1.50% 〇% < Cr < 1.00% 〇% < Ni < 0.50% 〇% < Mo < 0.20% 〇% < Nb &lt ; 0.050% 〇% < V < 0.30% 0% < A1 < 0.05% 0% < N < 0.020% The remainder consists of iron and impurities and residues that are affected by the melting conditions. 2 · For the steel of the scope of patent application 1, wherein: 0.10% of its chemical composition < V < 0_20%. 3 · For the steel of the first or second patent application scope, wherein: 0.020% of its chemical composition < Nb < 0.030% 〇4 · For example, the steel of the first or second patent scope, wherein: its chemistry In the composition of 200825188 0.010% < N < 0.020% 〇 5 · as claimed in the scope of the first or second steel, wherein: its chemical composition T- 0.45% < C < 0.55% 0.50% < Si < 0.70% 0.90% < Μη < 1.10% 0.10% < Cr < 0.40% 0.10% < Ni < 0.30% 0.10% < V < 0.20% 0.010% < A1 < 0.020% 0.020% < Nb < 0.030% 0.010% < N < 0.020% 〇6· For the steel of the first or second item of the patent application, Its chemical composition is 0.45% < C < 0.55% 0.50% < Si < 0.70% 0.90% < Mn < 1.10% 0.10% < Cr < 0.40% 0.10% < Ni < 0.30% 0.10 % < V < 0.20% 0.010% < A1 < 0.020% 0.020% < Nb < 0.030% 0.010% < N < 0.020% 0.020% < Ti < 0.030% 〇10 200825188 m 7. For example, in the steel of patent scope 帛1 or 2, the chemical composition of 〃 0.45% 0.50% 0.90% 0.30% 〇% 0.10% 0.010% 0.020% 0.015% <<<<<<<<<<<<<<<><<>><<<<<<<<<<<<<><<>><<>><<>><>> The automobile can be V: the component manufactured by the steel of the first patent of the dry circumference, Member are separated, Xi f Μ wide wave after having connected to Po ★ Α dagger at a controlled pressure and cooled, the carrier-configuration k, comprising the special carbide precipitates. 9. The components of claim 8 of the patent scope, wherein: after the controlled heat of cooling, the extension limit exceeds 75 square millimeters. 10 ′ The components of the ninth item of the scope of the patent application, wherein: after cooling by Ai y y hot work, the tensile strength exceeds 95 〇 N / square millimeter and is also lower than 12 〇〇 n / square centimeter. 11 · The component of claim 10, wherein: after cooling from the deformation heat control, the tensile elongation exceeds 丨〇%. 12. If the component of claim 11 is applied, in which the area after the destruction is controlled to be cooled, the area after the damage is reduced by more than 25 11 200825188 % 0 13. The component of claim 12, wherein: The member can be broken and separated. 14. The component of claim 13 wherein: the component is suitable for induction hardening. 1 5. The component of claim 14 of the patent application, wherein: the material before the forging and the mechanical properties in the component can be adjusted by thermomechanical treatment. Η•1, Schema: None 12