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A technology with high tensile strength and tensile strength, applied in the direction of furnace type, furnace, heat treatment furnace, etc., can solve the problems of increasing mechanical strength and insufficient ductility
Inactive Publication Date: 2016-05-11
NV BEKAERT SA
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However, it has been found that increasing the mechanical strength beyond a certain limit results in insufficient ductility of this steel, taking into account the preforming and bending operations which have to be carried out with respect to the spring wire
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Embodiment 2
[0082] In this example, a heat treatment similar to Example 1 was applied to a steel wire having a diameter of 3.75 mm and having the following steel composition:
[0083] -C% weight percentage = 0.55
[0084] - Si% weight percent = 1.4
[0085] -Cr% weight percent = 0.6
[0086] -Mn% by weight = 0.7
[0087] The rest is iron and unavoidable impurities.
[0088] After heat treatment, the steel wire mainly has a martensitic microstructure. The steel wire was further subjected to six drawing steps, and its diameter was reduced to 2.8mm. The properties of the wire after each pass are shown in Table 2. Despite the extremely high tensile strength obtained after six passes, the steel wire still has sufficient ductility as indicated by an area reduction of 52.8%. Moreover, the ductility of the steel wires was ensured during the whole wire drawing process, which can be verified by the area reduction of the steel wires exceeding 52.8% after one to six passes, as shown in Table 2....
Embodiment 3
[0092] In this example, the difference from the sample of Example 2 is that, after similar heat treatment, a martensitic steel wire having a diameter of 3.75 mm was drawn through three passes.
[0093] The diameter, diameter reduction, cross-sectional reduction, cumulative cross-sectional reduction, tensile strength, tensile strength change and area reduction of steel wires through this three-pass process after each pass are summarized in Table 3.
[0094]For the three-pass process, the average diameter reduction per pass was about 9.5%, which is almost twice that of the six-pass process as shown in Examples 1 and 2. The tensile strength (Rm) of three-pass wire drawing (SW3) as a function of section reduction (ΔS) in Figure 6 is plotted in , which is compared with the tensile strength of the six-pass wire drawing of Example 1 (SW1) and Example 2 (SW2). Such as Figure 6 As shown, the increase in tensile strength is almost proportional to the increase in section reduction fo...
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Abstract
A high tensile strength steel wire having as steel composition: a carbon content ranging from 0.20 weight percent to 1.00 weight percent, e.g. from 0.3 weight percent to 0.85 weight percent, e.g. from 0.4 weight percent to 0.7 weight percent, e.g. from 0.5 weight percent to 0.6 weight percent, a silicon content ranging from 0.05 weight percent to 2.0 weight percent, e.g. from 0.2 weight percent to 1.8 weight percent, e.g. from 1.2 weight percent to 1.6 weight percent, a manganese content ranging from 0.40 weight percent to 1.0 weight percent, e.g. from 0.5 weight percent to 0.9 weight percent, a chromium content ranging from 0.0 weight percent to 1.0 weight percent, e.g. from 0.5 weight percent to 0.8 weight percent, a sulfur and phosphor content being individually limited to 0.05 weight percent, e.g. limited to 0.025 weight percent, contents of nickel, vanadium, aluminum, copper or other micro-alloying elements all being individually limited to 0.5 weight percent, e.g. limited to 0.2 weight percent, e.g. limited to 0.08 weight percent, the remainder being iron, said steel wire having martensitic structure, wherein at least 10 volume percent of martensite are oriented.
Description
technical field [0001] The present invention relates to a high tensile strength steel wire, a method for producing a high tensile strength steel wire and the use or application of such a high tensile strength steel wire as a spring wire or as an element for the production of a rope. Background technique [0002] Springs are usually made of steel alloys. The most commonly used spring steels are music wire, oil tempered wire, chrome silicon, chrome vanadium, and 302 and 17-7 stainless steel. Spring wire made from chromium silicon, chrome vanadium is a higher quality, higher strength variation of oil tempered wire. [0003] Spring steels used in applications such as automotive valve springs are generally required to have very high tensile and yield strengths. Tensile strength is the ability of a material to resist attempts to pull or stretch it. Tensile strength is an important property for wires used in spring applications. For example, a tension spring worked above its te...
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