SBQ / MBQ / Rebar Product Information

Sizes: Hot Rolled Rounds: 3/4" - 4" in 1/16" increments. Other round sizes, and round cornered squares; please inquire. Flats: 1 3/4" - 4" Lengths 15' to 60', cut to your requirements Grades ASTM A29, A304 Carbon Series: 10XX, 11XX (.13 maximum sulfur) and 15XX. Alloy Series: 13XX, 40XX, 41XX, 46XX, 51XX, and 86XX. Standard and H Grades. Boron Steels Microalloy Steels Micromizer® 2 (MM2) Micromizer® 3 (MM3) Microtuff® 10 (MT10) Microtuff® 15 (MT15) Grain Refiners Niobium (Columbium), Vanadium, Aluminum Rolling Cycles Rounds from 3/4" to 4" every 4 weeks Flats every 8 weeks Order Size 20 Ton minimum per size, grade, and length to be shipped before the next rolling of that size. 300 tons for a non-standard size. Reduction Ratios and Weight Per Foot Standard Sizes Weight Per Foot Reduction Ratio 3/4" 1.503 95.6 13/16" 1.765 81.4 7/8" 2.046 70.2 15/16" 2.349 61.1 1" 2.673 53.8 1-1/16" 3.017 47.6 1-1/8" 3.383 44.9 1-3/16" 3.769 37.1 1-1/4" 4.176 36.2 1-5/16" 4.604 34.4 1-11/32" 4.827 29.8 1-3/8" 5.053 28.4 1-7/16" 5.523 26.0 1-1/2" 6.014 23.9 1-9/16" 6.526 22.0 1-5/8" 7.058 20.4 1-11/16" 7.611 18.9 1-3/4" 8.186 17.6 1-13/16" 8.781 16.4 1-7/8" 9.397 15.3 1-15/16" 10.034 14.3 2" 10.691 13.4 2-1/16" 11.370 12.6 2-1/8" 12.070 11.9 2-3/16" 12.790 11.2 2-1/4" 13.531 10.6 2-3/8" 15.077 9.5 2-1/2" 16.705 8.6 2-9/16" 17.551 8.2 2-5/8" 18.418 7.8 2-3/4" 20.214 7.1 2-13/16" 21.143 6.8 3" 24.056 6.0 3-3/32" 25.584 5.6 3-1/8" 26.102 5.5 3-1/4" 28.232 5.1 3-3/8" 30.446 4.7 3-1/2" 32.743 4.4 3-9/16" 33.922 4.2 3-5/8" 35.123 4.1 3-3/4" 37.587 3.8 4" 42.766 3.4 MICROALLOY STEELS Microalloy technology has been recognized around the world to offer an improved economic alternative processing method for many applications. Chaparral has been involved in the development and implementation of microalloy steels since 1977. Early applications were bar steels with enhanced as-rolled mechanical properties and components for the oil field industry. The emphasis of Chapparal's research for the past five years has been to develop several grades of microalloy steels for the forging industry. Traditional microalloy steels have always required a trade off between strength and toughness. In addition these steels demanded close process controls of heating, low forge temperature and precise controlled cooling rates to achieve a quality component. Chapparal's product development teams have worked closely with forging companies to provide a forger-friendly series of patented and trademarked grades to overcome these obstacles. The low toughness of traditional medium carbon steels is due to the microalloy precipitation, large volume fractions of pearlite in the microstructure, and coarse as-forged grain size. Our new microalloy steels are low carbon based that result in forgings that are fine grain bainitic or martensitic microstructures, depending on the grade, with enhanced impact properties. Microalloyed forging steels can replace, in carefully defined conditions, steels which are normally used in the quench and tempered condition. The elimination of heat treatment, the reduced risk of distortion, residual stresses, cracking and the elimination of straightening can reduce costs of components. These steels have at least as good a machinability as the quench and tempered steels of equivalent strength that they replace. Overall cost savings can be achieved when microalloy steels replace plain carbon steels with even greater savings when they replace alloy steels. Our microalloy bars are of Special Bar Quality, for the application of forging, that conform to the applicable requirements of the current edition of ASTM A29. Material is fully killed and made to a fine grained practice. In addition to the grades developed by Chapparal we can use our microalloy experience to supply you with performance microalloys made to your customer's specifications. Chapparal invites you to forge, test and compare their microalloy steels in your own shops at absolutely no risk and cost to you. One of our metallurgists will schedule a presentation with you that will cover the basics of microalloying and implementation of the free trial. If you desire you can use this presentation process to introduce your customers to this important microalloy alternative. MICROMIZER® 2 The primary use of Chapparal's trademark microalloy grade, Micromizer® 2, is to achieve off-the-forge properties in components that normally use conventional carbon steels that require post processing (quench and temper) to attain hardness in the 20-28 Rockwell C range. Micromizer® 2's low carbon content and hardenability intensifying elements, when air cooled from forging temperatures, result in a fine grained bainitic microstructure with stabilized retained austenite in the as-forged condition. During selection of potential substitutions to use Micromizer® 2 it should be considered that the forging is at full strength which may affect machining if it is required. Manufacture: The steel is made by the electric arc furnace process from 100% scrap. Hot wrought bars of Special Bar Quality are rolled from continuously cast billets for the application of forging. Materials furnished shall conform to the applicable requirements of the current edition of ASTM A29. Material is fully killed and made to a fine grain practice. The bars shall be free of pipe, cracks, and flakes. Within the limits of good manufacturing and inspection practices, the bars shall be free from injurious seams, laps, segregation or other imperfections which due to their nature, degree, or extent, will interfere with the use of the material in forging suitable parts. Micromizer® 2 hot rolled bars may be ordered to ASTM A921 by designating the chemistry and Type B grain refiner. Resulting forgings should be capable of meeting the requirements of ASTM A909 Class 80 Type B. Customer specifications agreed upon between Chapparal and it's customers may further define in, quantitative terms, the quality description of this material. Processing: Micromizer® 2 is designed to be air cooled from normal forging temperatures. Care must be taken not to overheat (>2350°F) this grade or a loss of grain refinement and physical properties may occur. It is preferred to set forging temperature aims to a max of 2300°F. Practice should be established to begin the desired air cooling rate with the finished forging above 1600°F. Air cooling rates can range from bin cool to forced air depending upon the section size and the required physical properties. The chemistry of this grade has been designed to produce a predominant bainitic microstructure over a wide range of cooling rates. This range can be described as a continuous cooling rate that lowers the temperature of the forging to under 400°F from a minimum of 5 minutes to a maximum of 35 minutes. Cooling rates that are not in this range will result in components with a mixed microstructure. Air cooling with a conveyor will result in less variation of properties from part to part. Mechanical Properties: The variation of chemistry of Micromizer® 2 will produce an as-forged hardness in the range of 20-28 Rockwell C. This hardness will be consistent in sections up to 1-1/4" cross-sectional mass. Optimum properties are only achieved when the entire component section is uniform with a predominant bainitic microstructure. Satisfactory forgings with larger cross-sections can be produced with mixture structures that have slightly lower properties. Tensile properties will typically be in the range of 115-135 KSI ultimate strength, 80-125 KSI yield strength, percent elongations greater than 15% and reduction of area greater than 45%. Short rod fracture toughness values for critical stress intensity (KIC) are greater than 60 KSI/in at 0°F indicating plasticity at temperatures below zero. Micromizer® 2 has the ability to distribute strain throughout the section more uniformly than conventional steels. The strength level of Micromizer® 2 forgings will be higher than the normal strength to hardness correlation would suggest. Post Forge Heat Treatment: Forgings may be heat treated to increase or decrease the as-forged properties particularly the yield to ultimate tensile strength ratio. Micromizer® 2 will respond to tempering treatments with an increasing yield strength with increasing temperature up to 1000°F. A 30 percent increase is possible at the maximum temperature. Ultimate strength remains constant with increasing temperature up to 750°F and then begins to soften. A slight loss in elongation and increase in reduction of area will occur as tempering temperature increases. This grade is suitable to quench and temper heat treatments that are based upon practices and temperatures for heat treating AISI 1522. Tagging Information: The tag attached to the end of each bundle will have the grade designated MM2 instead of the complete Micromizer® 2. Restrictive and Special Chemical Specifications made on request. MICROMIZER® 3 The primary use of Chapparal's trademark microalloy grade, Micromizer® 3, is to achieve off-the-forge properties in components that normally use conventional carbon steels that require post processing (quench and temper) to attain hardness in the 20-30 Rockwell C range. The elevated carbon content above Micromizer® 2 is intended to achieve selective surface hardening objectives. Micromizer®3's medium carbon content and hardenability intensifying elements, when air cooled from forging temperatures, result in a fine grained bainitic microstructure with stabilized retained austenite in the as-forged condition. During selection of potential substitutions to use Micromizer® 3 it should be considered that the forging is at full strength which may affect machining if it is required. Manufacture: The steel is made by the electric arc furnace process from 100% scrap. Hot wrought bars of Special Bar Quality are rolled from continuously cast billets for the application of forging. Materials furnished shall conform to the applicable requirements of the current edition of ASTM A29. Material is fully killed and made to a fine grain practice. The bars shall be free of pipe, cracks, and flakes. Within the limits of good manufacturing and inspection practices, the bars shall be free from injurious seams, laps, segregation or other imperfections which due to their nature, degree, or extent, will interfere with the use of the material in forging suitable parts. Customer specifications agreed upon between Chapparal and it's customers may further define in, quantitative terms, the quality description of this material. Processing: Micromizer® 3 is designed to be air cooled from normal forging temperatures. Care must be taken not to overheat (>2400°F) this grade or a loss of grain refinement and physical properties may occur. It is preferred to set forging temperature aims to a max of 2350°F. Resulfurized variations of Micromizer® 3 should have these forging temperature aims and maximums lowered by 50°F. Practice should be established to begin the desired air cooling rate with the finished forging above 1600°F. Air cooling rates can range from bin cool to forced air depending upon the section size and the required physical properties. The chemistry of this grade has been designed to produce a predominant bainitic microstructure over a wide range of cooling rates. This range can be described as a continuous cooling rate that lowers the temperature of the forging to under 400°F from a minimum of 5 minutes to a maximum of 35 minutes. Cooling rates that are not in this range will result in components with a mixed microstructure. Air cooling with a conveyor will result in less variation of properties from part to part. Mechanical Properties: The variation of chemistry of Micromizer® 3 will produce an as-forged hardness in the range of 20-30 Rockwell C. This range is broad to include the differences that result for all air cooling conditions. It can be expected that the range for a particular controlled cooling rate will show no more than two point Rockwell C variation. This hardness will be consistent in sections up to 1-1/2" cross-sectional mass. Optimum properties are only achieved when the entire component section is uniform with a predominant bainitic microstructure. Satisfactory forgings with larger cross-sections can be produced with mixture structures that have slightly lower properties. Tensile properties will typically be in the range of 120-140 KSI ultimate strength, 80-125 KSI yield strength, percent elongations greater than 12% and reduction of area greater than 30%. Charpy impact V-notch properties are greater than 12 Ft-Lbs at 0°F indicating plasticity at temperatures below zero. Micromizer® 3 has the ability to distribute strain throughout the section more uniformly than conventional steels. The strength level of Micromizer® 3 forgings will be higher than the normal strength to hardness correlation would suggest. Tagging Information: The tag attached to the end of each bundle will have the grade designated MM3 instead of the complete Micromizer® 3. MICROTUFF® 10 The primary use of Chapparal's patented microalloy grade, Microtuff® 10, is to achieve off-the-forge properties in components that normally use conventional carbon and alloy steels that require post processing (quench and temper) to attain hardness in the 38-42 Rockwell C range. Microtuff® 10's low carbon content and hardenability intensifying elements, when water quenched from forging temperatures, result in a fine grained auto-tempered martensitic microstructure. During selection of potential substitutions to use Microtuff® 10 it should be considered that the forging is at full strength which may affect machining if it is required. Manufacture: The steel is made by the electric arc furnace process from 100% scrap. Hot wrought bars of Special Bar Quality are rolled from continuously cast billets for the application of forging. Materials furnished shall conform to the applicable requirements of the current edition of ASTM A29. Material is fully killed and made to a fine grain practice. The bars shall be free of pipe, cracks, and flakes. Within the limits of good manufacturing and inspection practices, the bars shall be free from injurious seams, laps, segregation or other imperfections which due to their nature, degree, or extent, will interfere with the use of the material in forging suitable parts. Customer specifications agreed upon between Chapparal and it's customers may further define in, quantitative terms, the quality description of this material. Processing: Microtuff® 10 is designed to be quenched in water from normal forging temperatures. Care must be taken not to overheat (>2350°F) this grade or a loss of grain refinement and physical properties may occur. Practice should be established to enter the quench with the finished forging above 1700°F. A spray water conveyor or immersion water quench that can quickly lower the temperature below 300°F is required. If an immersion quench is used the water should be briskly agitated to insure uniform results. In most applications it is desirable to control and prevent the quench water from attaining a boiling state. The preferred range of quench water is 70°F - 180°F. When components are air cooled from the forge to facilitate machining in the softer condition the reaustenitizing temperature shall be above 1700°F. Quench water conditions are the same as stated above for the direct quench forgings. It is not necessary to temper the quenched forgings. Tempering may be used if it is desired to maximize impact toughness. Mechanical Properties: The variation of chemistry of Microtuff® 10 will produce an as-forged hardness in the range of 38-42 Rockwell C. This hardness will be consistent in sections up to 1-1/2" mass. Optimum properties are only achieved when the entire component section is uniform with a martensitic microstructure. Satisfactory forgings with larger cross-sections can be produced with mixture structures that have slightly lower properties. Tensile properties will be in the range of 140-190 KSI ultimate strength, 100-165 KSI yield strength, percent elongations greater than 10% and reduction of area greater than 30%. Charpy impact V-notch properties are greater than 15 Ft-Lbs at -22°F indicating plasticity at temperatures below zero. Tagging Information: The tag attached to the end of each bundle will have the grade designated MT10 instead of the complete Microtuff® 10. MICROTUFF® 15 The primary use of Chapparal's patented microalloy grade, Microtuff® 15, is to achieve off-the-forge properties in components that normally use conventional carbon and alloy steels that require post processing (quench and temper) to attain hardness in the 41-45 Rockwell C range. Microtuff® 15's low carbon content and hardenability intensifying elements, when water quenched from forging temperatures, result in a fine grained self-tempered martensitic microstructure in the as-forged condition. During the selection of potential substitutions to use Microtuff® 15 it should be considered that the forging is at full strength which may affect machining if it is required. Manufacture: The steel is made by the electric arc furnace process from 100% scrap. Hot wrought bars of Special Bar Quality are rolled from continuously cast billets for the application of forging. Materials furnished shall conform to the applicable requirements of the current edition of ASTM A29. Material is fully killed and made to a fine grain practice. The bars shall be free of pipe, cracks, and flakes. Within the limits of good manufacturing and inspection practices, the bars shall be free from injurious seams, laps, segregation or other imperfections which due to their nature, degree, or extent, will interfere with the use of the material in forging suitable parts. Customer specifications agreed upon between Chapparal and it's customers may further define in, quantitative terms, the quality description of this material. Processing: Microtuff® 15 is designed to be quenched in water from normal forging temperatures. Care must be taken not to overheat (>2350°F) this grade or a loss of grain refinement and physical properties may occur. Practice should be established to enter the quench with the finished forging above 1600°F. A spray water conveyor or immersion water quench that can quickly lower the temperature below 300°F is required. If an immersion quench is used the water should be briskly agitated to insure uniform results. In most applications it is desirable to control and prevent the quench water from attaining a boiling state. It is not necessary to temper the quenched forgings. Tempering may be used if it is desired to maximize impact toughness. Mechanical Properties: The variation of chemistry of Microtuff® 15 will produce an as-forged hardness in the range of 41-45 Rockwell C. This hardness will be consistent in sections up to 1-1/2" mass. Optimum properties are only achieved when the entire component section is uniform with a martensitic microstructure. Satisfactory forgings with larger cross-sections can be produced with mixture structures that have slightly lower properties. Tensile properties will be in the range of 175-210 KSI ultimate strength, 135-165 KSI yield strength, percent elongations greater than 8% and reduction of area greater than 25%. Charpy impact V-notch properties are greater than 20 Ft-Lbs at 0°F indicating plasticity at temperatures below zero. Tagging Information: The tag attached to the end of each bundle will have the grade designated MT15 instead of the complete Microtuff® 15.

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