Ring rail type sliding shoe high-strength steel material

Abstract

The invention relates to the field of heavy-load sliding mobile equipment, and discloses a circular track type sliding shoe high-strength steel material which is composed of the following components in percentage by mass: 0.38%-0.44% of C, 0.75%-0.95% of Mn, 0.35%-0.45% of Zn, 0.1%-0.7% of S i, 0.9%-1.4% of Cr, 0.13%-0.18% of Ti, 1.3%-1.8% of N i, 0.15%-0.30% of Mo, limited to be less than or equal to 0.03% of P, less than or equal to 0.03% of S, less than or equal to 0.04% of Al, less than or equal to 0.25% of Cu, less than or equal to 0.1% of V and the balance of Fe and inevitable impurities. The preparation technology of the steel material comprises the following steps that firstly, all the raw materials are obtained in proportion, and after being mixed, the raw materials are melted and refined through an electric furnace to obtain molten steel; 2, after refining is completed, molten steel is poured, and a cast steel blank is obtained; 3, after the cast steel blank body is cooled at the room temperature, the cast steel blank body is pretreated; fourthly, the pretreated steel billet is subjected to two-section forging machining; and fifthly, the forged steel billet is subjected to heat treatment, and the required high-strength steel material is obtained after cooling.

Description

Technical Field

[0001] The present invention relates to the field of heavy-load sliding mobile equipment, and more specifically, to a high-strength steel material for a ring-rail sliding shoe. Background Art

[0002] A ring-track sliding shoe is a device that runs on a ring track, and is usually used for heavy equipment such as cranes to improve its stability and load-bearing capacity. The ring-track sliding shoe is mainly made of metal materials. Since it needs to bear weight and rub against the track during use, it is easy to wear after use and has a short service life. Based on this, the present invention provides a high-strength steel material for the ring-track sliding shoe. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a ring rail type sliding shoe high-strength steel material, which has the advantages of high strength and strong wear resistance.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a high-strength steel material for a ring rail sliding shoe, composed of the following components in mass percentage: C: 0.38%~0.44%, Mn: 0.75%~0.95%, Zn: 0.35%~0.45%, Si: 0.1%~0.7%, Cr: 0.9%~1.4%, Ti: 0.13%~0.18%, Ni: 1.3%~1.8%, Mo: 0.15%~0.30%, and P is limited to 0.03%, S≤0.03%, Al≤0.04%, Cu≤0.25%, V≤0.1%, and the balance is Fe and unavoidable impurities.

[0005] As a preferred technical solution of the present invention, the steel material is composed of the following components in mass percentage: C: 0.42%, Mn: 0.85%, Zn: 0.10%, Si: 0.42%, Cr: 1.2%, Ti: 0.14%, Ni: 1.5%, Mo: 0.22%, P: 0.02%, S: 0.02%, Al: 0.03%, Cu: 0.05%, V: 0.05%, and the balance is Fe and unavoidable impurities.

[0006] As a preferred technical solution of the present invention, the steel material is composed of the following components in mass percentage: C: 0.39%, Mn: 0.76%, Zn: 0.36%, Si: 0.17%, Cr: 0.9%, Ti: 0.13%, Ni: 1.3%, Mo: 0.15%, P: 0.02%, S: 0.02%, Al: 0.02%, Cu: 0.20%, V: 0.08%, and the balance is Fe and unavoidable impurities.

[0007] As a preferred technical solution of the present invention, the steel material is composed of the following components in mass percentage: C: 0.44%, Mn: 0.95%, Zn: 0.45%, Si: 0.7%, Cr: 1.4%, Ti: 0.18%, Ni: 1.8%, Mo: 0.30%, P: 0.02%, S: 0.03%, Al: 0.03%, Cu: 0.15%, V: 0.06%, and the balance is Fe and unavoidable impurities.

[0008] As a preferred technical solution of the present invention, the present invention also discloses a preparation process of a ring rail type sliding shoe high-strength steel material, comprising the following steps:

[0009] Step 1: obtain various raw materials in proportion, mix the raw materials, and then melt and refine them in an electric furnace to obtain molten steel;

[0010] Step 2: After refining, the molten steel is poured to obtain a cast steel billet;

[0011] Step 3: After the cast steel blank is cooled at room temperature, the cast steel blank is pretreated;

[0012] Step 4: Perform two-stage forging processing on the pretreated steel billet;

[0013] Step 5: Heat treat the forged steel billet and obtain the required high-strength steel material after cooling.

[0014] As a preferred technical solution of the present invention, in the step 1, a molten steel sample is obtained during the molten steel refining process, and a spectral detection is performed on the sample to determine whether each component in the molten steel meets the formula requirements.

[0015] As a preferred technical solution of the present invention, in step three, the pretreatment process is to heat the steel billet to 680-720°C, keep it at this temperature for 2h-3h, and then cool it to room temperature.

[0016] As a preferred technical solution of the present invention, in the step 4, the first forging process is: heating the steel billet to 1180℃~1260℃, holding time is not less than 60min, the start forging temperature is 1190℃~1270℃, and the final forging temperature is ≥1050℃; the second forging process is: heating the steel billet to 980℃~1060℃, holding time is not less than 80min, the start forging temperature is 1030℃~1060℃, and the final forging temperature is ≥980℃.

[0017] As a preferred technical solution of the present invention, in step 4, the total reduction in the first stage forging is 40% to 50%, and the total reduction in the second stage forging is 30% to 35%.

[0018] As a preferred technical solution of the present invention, in step five, the normalizing temperature is 840°C to 880°C, the holding time is 60min to 90min, and then air-cooled to room temperature, and the high-temperature tempering temperature is 640°C to 680°C, and the holding time is 11h to 13h.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: by optimizing the weight ratio of each component in the steel material, the steel structure obtained has excellent mechanical properties, high strength and good wear resistance, can adapt to the working environment of the sliding shoe, and has a long working life. DETAILED DESCRIPTION

[0020] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0021] Embodiment 1:

[0022] A high-strength steel material for a ring rail sliding shoe is composed of the following components in percentage by mass: C: 0.42%, Mn: 0.85%, Zn: 0.10%, Si: 0.42%, Cr: 1.2%, Ti: 0.14%, Ni: 1.5%, Mo: 0.22%, P: 0.02%, S: 0.02%, Al: 0.03%, Cu: 0.05%, V: 0.05%, and the balance is Fe and unavoidable impurities.

[0023] A preparation process of a ring rail type sliding shoe high strength steel material comprises the following steps:

[0024] Step 1: obtain various raw materials in proportion, mix the raw materials, and then use an electric furnace to melt and refine them to obtain molten steel; during the refining process of the molten steel, obtain molten steel samples, perform spectral detection on the samples, and determine that the various components in the molten steel meet the formula requirements.

[0025] Step 2: After refining, the molten steel is poured to obtain a cast steel billet.

[0026] Step 3: After the cast steel billet is cooled at room temperature, the cast steel billet is pretreated; the pretreatment process is to heat the billet to 700° C., keep it at this temperature for 2.5 hours, and then cool it to room temperature.

[0027] Step 4: Perform two-stage forging processing on the pretreated steel billet;

[0028] The first forging process is: heating the billet to 1140℃, holding time for 80min, starting forging temperature of 1230℃, and final forging temperature of 1120℃; the second forging process is: heating the billet to 1020℃, holding time for 90min, starting forging temperature of 10400℃, and final forging temperature of 1020℃; the total reduction in the first forging stage is 45%, and the total reduction in the second forging stage is 33%.

[0029] Step 5: Heat treat the forged steel billet and obtain the required high-strength steel material after cooling. Normalizing temperature is 860℃, holding time is 75min, then air-cooling to room temperature, high temperature tempering temperature is 660℃, holding time is 12h.

[0030] Embodiment 2:

[0031] A high-strength steel material for a ring rail sliding shoe is composed of the following components in percentage by mass: C: 0.39%, Mn: 0.76%, Zn: 0.36%, Si: 0.17%, Cr: 0.9%, Ti: 0.13%, Ni: 1.3%, Mo: 0.15%, P: 0.02%, S: 0.02%, Al: 0.02%, Cu: 0.20%, V: 0.08%, and the balance is Fe and unavoidable impurities.

[0032] A preparation process of a ring rail type sliding shoe high strength steel material comprises the following steps:

[0033] Step 1: obtain various raw materials in proportion, mix the raw materials, and then use an electric furnace to melt and refine them to obtain molten steel; during the refining process of the molten steel, obtain molten steel samples, perform spectral detection on the samples, and determine that the various components in the molten steel meet the formula requirements.

[0034] Step 2: After refining, the molten steel is poured to obtain a cast steel billet.

[0035] Step 3: After the cast steel billet is cooled at room temperature, the cast steel billet is pretreated; the pretreatment process is to heat the billet to 680° C., keep it at this temperature for 2 hours, and then cool it to room temperature.

[0036] Step 4: Perform two-stage forging processing on the pretreated steel billet;

[0037] The first forging process is: heating the steel billet to 1180℃, holding time for 60min, starting forging temperature at 1190℃, and final forging temperature at 1050℃; the second forging process is: heating the steel billet to 980℃, holding time for 80min, starting forging temperature at 1030℃, and final forging temperature at 980℃; the total reduction in the first forging stage is 40%, and the total reduction in the second forging stage is 30%.

[0038] Step 5: Heat treat the forged steel billet and obtain the required high-strength steel material after cooling. The normalizing temperature is 840℃, the holding time is 60min, and then air-cooled to room temperature. The high-temperature tempering temperature is 640℃, and the holding time is 11h.

[0039] Embodiment three:

[0040] A high-strength steel material for a ring rail sliding shoe is composed of the following components in percentage by mass: C: 0.44%, Mn: 0.95%, Zn: 0.45%, Si: 0.7%, Cr: 1.4%, Ti: 0.18%, Ni: 1.8%, Mo: 0.30%, P: 0.02%, S: 0.03%, Al: 0.03%, Cu: 0.15%, V: 0.06%, and the balance is Fe and unavoidable impurities.

[0041] A preparation process of a ring rail type sliding shoe high strength steel material comprises the following steps:

[0042] Step 1: obtain various raw materials in proportion, mix the raw materials, and then use an electric furnace to melt and refine them to obtain molten steel; during the refining process of the molten steel, obtain molten steel samples, perform spectral detection on the samples, and determine that the various components in the molten steel meet the formula requirements.

[0043] Step 2: After refining, the molten steel is poured to obtain a cast steel billet.

[0044] Step 3: After the cast steel billet is cooled at room temperature, the cast steel billet is pretreated; the pretreatment process is to heat the billet to 720° C., keep it at this temperature for 3 hours, and then cool it to room temperature.

[0045] Step 4: Perform two-stage forging processing on the pretreated steel billet;

[0046] The first forging process is: heating the billet to 1260℃, holding time for 90min, starting forging temperature of 1270℃, and final forging temperature of 1150℃; the second forging process is: heating the billet to 1060℃, holding time for 100min, starting forging temperature of 1060℃, and final forging temperature of 1080℃; the total reduction in the first forging stage is 50%, and the total reduction in the second forging stage is 35%.

[0047] Step 5: Heat treat the forged steel billet and obtain the required high-strength steel material after cooling. The normalizing temperature is 880℃, the holding time is 90min, and then air-cooled to room temperature, and the high-temperature tempering temperature is 680℃, and the holding time is 13h.

[0048] The steel material prepared in the embodiment and the steel material used in the existing skid shoe were tested for performance, and the measured performance data are shown in the following table:

[0049] Embodiment 1 Embodiment 2 Embodiment 3 Comparative Example Tensile strength(MPa) 1062 1058 1067 880 Yield strength(MPa) 947 953 951 760 Brinell Hardness (HWB) 322 318 324 260

[0050] As can be seen from the above table, the steel material disclosed in the present invention has excellent mechanical properties and impact resistance, can meet the high strength and high impact resistance requirements of the sliding shoe, and effectively resist the instantaneous impact force suffered by the guide sliding shoe. In addition, the wear resistance test was conducted on the steel material prepared in the embodiment and the steel material used in the existing sliding shoe. Under the same friction and sliding conditions, the loss of the steel material prepared in this embodiment is 30% to 40% of the loss of the existing steel material, which effectively extends the service life.

[0051] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-strength steel material for a ring rail type sliding shoe, characterized in that: It is composed of the following components in mass percentage: C: 0.38% ~ 0.44%, Mn: 0.75% ~ 0.95%, Zn: 0.35% ~ 0.45%, Si: 0.1% ~ 0.7%, Cr: 0.9% ~ 1.4%, Ti: 0.13% ~ 0.18%, Ni: 1.3% ~ 1.8%, Mo: 0.15% ~ 0.30%, and P is limited to 0.03%, S ≤ 0.03%, Al ≤ 0.04%, Cu ≤ 0.25%, V ≤ 0.1%, and the balance is Fe and unavoidable impurities.

2. The high-strength steel material for the ring rail type sliding shoe according to claim 1, characterized in that: The steel material is composed of the following components in mass percentage: C: 0.42%, Mn: 0.85%, Zn: 0.10%, Si: 0.42%, Cr: 1.2%, Ti: 0.14%, Ni: 1.5%, Mo: 0.22%, P: 0.02%, S: 0.02%, Al: 0.03%, Cu: 0.05%, V: 0.05%, and the balance is Fe and unavoidable impurities.

3. The high-strength steel material for the ring rail type sliding shoe according to claim 1, characterized in that: The steel material is composed of the following components in mass percentage: C: 0.39%, Mn: 0.76%, Zn: 0.36%, Si: 0.17%, Cr: 0.9%, Ti: 0.13%, Ni: 1.3%, Mo: 0.15%, P: 0.02%, S: 0.02%, Al: 0.02%, Cu: 0.20%, V: 0.08%, and the balance is Fe and unavoidable impurities.

4. The high-strength steel material for the ring rail type sliding shoe according to claim 1, characterized in that: The steel material is composed of the following components in mass percentage: C: 0.44%, Mn: 0.95%, Zn: 0.45%, Si: 0.7%, Cr: 1.4%, Ti: 0.18%, Ni: 1.8%, Mo: 0.30%, P: 0.02%, S: 0.03%, Al: 0.03%, Cu: 0.15%, V: 0.06%, and the balance is Fe and unavoidable impurities.

5. A process for preparing a high-strength steel material for a ring rail type sliding shoe according to any one of claims 1 to 4, characterized in that: The steps include: Step 1: obtain various raw materials in proportion, mix the raw materials, and then melt and refine them in an electric furnace to obtain molten steel; Step 2: After refining, the molten steel is poured to obtain a cast steel billet; Step 3: After the cast steel blank is cooled at room temperature, the cast steel blank is pretreated; Step 4: Perform two-stage forging processing on the pretreated steel billet; Step 5: Heat treat the forged steel billet and obtain the required high-strength steel material after cooling.

6. The process for preparing the high-strength steel material of the ring rail type sliding shoe according to claim 5, characterized in that: In the step 1, a molten steel sample is obtained during the molten steel refining process, and a spectral test is performed on the sample to determine whether each component in the molten steel meets the formula requirements.

7. The process for preparing the high-strength steel material of the ring rail type sliding shoe according to claim 5, characterized in that: In the step 3, the pretreatment process is to heat the steel billet to 680-720° C., keep it at this temperature for 2-3 hours, and then cool it to room temperature.

8. The process for preparing the high-strength steel material of the ring rail type sliding shoe according to claim 5, characterized in that: In the step 4, the first forging process is: heating the steel billet to 1180°C-1260°C, holding time is not less than 60min, the start forging temperature is 1190°C-1270°C, and the final forging temperature is ≥1050°C; the second forging process is: heating the steel billet to 980°C-1060°C, holding time is not less than 80min, the start forging temperature is 1030°C-1060°C, and the final forging temperature is ≥980°C.

9. The process for preparing the high-strength steel material of the ring rail type sliding shoe according to claim 5, characterized in that: In the step 4, the total reduction in the first stage of forging is 40% to 50%, and the total reduction in the second stage of forging is 30% to 35%.

10. The process for preparing the high-strength steel material of the ring rail type sliding shoe according to claim 5, characterized in that: In the step 5, the normalizing temperature is 840°C to 880°C, the holding time is 60min to 90min, and then air-cooled to room temperature, and the high-temperature tempering temperature is 640°C to 680°C, and the holding time is 11h to 13h.