THAI TECH STEEL (2013) CO.,LTD.

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1 THAI TECH STEEL (13) CO.,LTD. PRODUCT SPECIIFIICATIION CAST STEEL ROLL Roll materials of this group are high carbon alloy steels with carbon content ranging from.4 to 1.4 % by weight. The major alloying element is chromium with small amount of molybdenum to improve hardenability. Hardness of high carbon alloy rolls is in the range HSC to 42 depending on carbon content. Microstructure of cast steels with carbon less than.8% consists of proeutectoid ferrite and fine pearlite. The fraction of pearlite increases with increasing carbon content of the steels and provide the necessary hardness for wear resistance. At carbon content exceeding this proeutectoid cementite (primary carbide) appears in the microstructure with full pearlitic matrix. Some of the primary carbide dissolves into matrix and re-precipitate as small, uniformly dispearsed carbide particles (free carbide) in the matrix as a result of heat treatment. Due to the relatively low carbon content, small amount of carbide dispearsed in the tough pearlitic matrix provide the necessary toughness required in heavily stressed operations such as slabbing, blooming, and heavy section rolling. Limited carbon content also enables rolls to be welded under certain controlled conditions. With higher carbon content, the rolls are also capable to be used in medium section rolling and roughing in which superior wear resistance is demanded. Plate Roughing Sheet 2 and 3 High Roughing Wide strip 2 and 3 High Roughing Beam blanks Roughing Billets 2 and 3 High Roughing 2 and 3 High Roughing Medium section 2 and 3 High Roughing Super tough requirements. Microstructure 1 Pearlite matrix with small primary and secondary carbide. TCP (-42 ) ( ) BARREL 32 ~ ~ ~ ~.4 ~ JOURNAL ~ 55 ~ 85.5 ~ ~ 28.4 ~ TCPL S ~ 38.4 ~.6.3 ~.7.6 ~ 1..3 MAX.3 MAX 1. MAX.8 ~ MAX TCP-1 S 32 ~ 38.6 ~.8.3 ~.7.6 ~ 1..3 MAX.3 MAX -.8 ~ MAX TCP-2 S 35 ~.8 ~ 1..3 ~.7.6 ~ 1..3 MAX.3 MAX -.8 ~ MAX TCP-3 S 37 ~ ~ ~.7.6 ~ 1..3 MAX.3 MAX -.8 ~ MAX TCP-4 S 37 ~ ~ ~.7.6 ~ 1..3 MAX.3 MAX -.8 ~ MAX

2 THAI TECH STEEL (13) CO.,LTD. STEEL BASE ROLL Originally developed for roughing and intermediate rolling, adamite rolls are steel-base rolls having properties between those of cast iron rolls and high carbon cast steel rolls. Carbon contents of Adamite ranges from 1.4 to 2.4 wt.% with nickel, chromium and molybdenum as alloying elements. With higher content of carbon compound to cast steels, the hardness of Adamite can be controlled between HSC and 58 by adjusting chemical composition and heat treatment processes. Unique characteristics of Adamite are relatively high hardness while maintaining the levels of strength and toughness for operation requiring both wear resistance and mechanical strength. Microstructure of Adamite consists of hard primary carbide and free(secondary) carbide dispersed in the matrix of fine pearlite. Adamite rolls are suitable for roughing and intermediate rolling of sections, wire rods and bars. They are can used in finishing stand for section rolling. Plate Roughing Sheet 2 and 3 High - Wide strip 2 and 3 High Beam blanks Billets 2 and 3 High 2 and 3 High Medium section 2 and 3 High Bar and wire rod 2 and 3 High Roughing Toughness and wear-resisting requirements. Microstructure 1 Pearlite matrix with small primary and secondary carbide. T2SL,T2SA,T2SX (-55 ) ( ) BARREL ~ 58 ~.2 ~ ~ 23.2 ~ 1. JOURNAL 35 ~ ~ 65.2 ~ ~.2 ~ 1. T2SL S ~ ~ ~ 1..6 ~ 1..5 MAX.5 MAX.6 MAX.8 ~ MAX T2SA S 42 ~ ~ ~ 1..6 ~ 1..5 MAX.5 MAX.6 MAX.8 ~ MAX T2SB S 43 ~ ~ ~ 1..6 ~ 1..5 MAX.5 MAX.6 MAX.8 ~ MAX T2SC S 45 ~ 2.1 ~ ~ 1..6 ~ 1..5 MAX.5 MAX.6 MAX.8 ~ MAX T2SX S 45 ~ ~ ~ ~ 1..5 MAX.5 MAX.5 ~ 1..8 ~ MAX T2SS S ~ ~ ~ 1..6 ~ 1..5 MAX.5 MAX.5 ~ 1..8 ~ MAX

3 THAI TECH STEEL (13) CO.,LTD. T2DP Steel-base rolls having properties between those of cast iron rolls and high carbon cast steel rolls. Carbon contents ranges from 1.9 to 2.2 wt.% with nickel, chromium and molybdenum as alloying elements. With higher content of carbon compound to cast steels, the hardness of T2DP can be controlled between HSC 55 and 65 by adjusting chemical composition and heat treatment processes. Unique characteristics of Adamite are relatively high hardness while maintaining the levels of strength and toughness for operation requiring both wear resistance and mechanical strength. Microstructure of Adamite consists of hard primary carbide and free(secondary) carbide dispersed in the matrix of bainite. T2DP rolls are suitable for intermediate and finishing rolling of medium and heavy sections rolling. Beam blanks finishing Billets 2 and 3 High finishing 2 and 3 High finishing Medium section 2 and 3 High finishing Toughness and wear-resisting requirements. Static casting STEEL BASE ROLL T2DP Microstructure 1 SHELL STRUCTURE Bainite matrix with small primary and secondary carbide. Graphitic steel : Fine Pearlite matrix with primary carbides and spheroidal graphite CORE STRUCTURE Centrifugal casting FCD : Pearlite matrix with nodular graphite HSC ( ) BARREL 55 ~ 65 ~.2 ~ ~ 23.2 ~ 1. JOURNAL 35 ~ ~ 65.2 ~ ~.2 ~ 1. T2DP S/C 55 ~ ~ ~.8.6 ~ 1..4 MAX.5 MAX 1. ~ ~ 2..5 ~.8 *T2DP core is graphitic steel *TW2DP core is nodular

4 THAI TECH STEEL (13) CO.,LTD. GRAPHIITIIC STEEL ROLL Graphitic steel rolls were developed as substitute for Adamite rolls where high thermal stress and large elastic deformation must be absorbed by roll material. With higher content of silicon, carbon also precipitates as nodular graphite. Microstructure of graphitic steels therefore consists of both primary carbide and fine nodular graphite embedded in pearlite matrix. Graphitic steels have higher toughness and ductility than Adamite while the hardness remains in the range that ensures the wear resistance of rolls. Microstructure 1 Fine pearlite matrix with primary carbides and spheroidal graphite. Plate Roughing Sheet Roughing Wide strip Beam blanks Roughing Billets Medium section Tough and wear-resisting requirements. T2SY (- HCS.) ( ) BARREL ~ ~ ~ ~ 25.3 ~ 1. JOURNAL 35 ~ 45 ~.3 ~ 1.5 ~ 23.3 ~ 1. T2SXG S ~ ~ ~ ~ 1..5 MAX.5MAX.8 ~ ~ MAX T2SY S ~ 1.4 ~ ~ ~ 1..5 MAX.5MAX 1. ~ ~.9.4 MAX

5 THAI TECH STEEL (13) CO.,LTD. NODULAR CAST IIRON ((T8SM)) Nodular irons are belonged to a group of cast iron in which most of the carbon crystallizes as spherical particles known as graphite nodules. Remaining carbon combines with iron and chromium to form hard carbide which precipitates during the solidification to form the socalled mottled structure. Matrix of nodular iron rolls is fine pearlitic which provides toughness and strength required in rolling operations. Wide range of properties may be obtained by adjusting the three major alloying elements: chromium, nickel, and molybdenum. The low nickel grade provides optimal hardness with high strength and toughness which makes it suitable for roughing and intermediate rolling. The medium nickel grade has higher surface hardness necessary for intermediate and finishing. High nickel and molybdenum grade provide excellent mechanical properties at high working temperature in terms of strength, toughness, and hardness. Seamless tube Reducing and Sizing Beam blanks Roughing Billets 2 and 3 High Medium section Bar and wire rod 2 and 3 High 2 and 3 High Microstructure 1 Fine pearlite matrix with small primary carbides and spheroidal graphite. T8SM (-55 HSC) ( ) BARREL ~ 55 ~ ~ 2. ~ 23.5 ~.8 1 ~ 1 JOURNAL 33 ~ 45 ~ 65.2 ~ ~ 21.2 ~.8 1 ~ 1 T8SM S ~ ~ ~ ~.6.8 MAX.2 MAX 1.3 ~ MAX.4 ~.8

6 THAI TECH STEEL (13) CO.,LTD. NODULAR CAST IIRON ((T8X)) Nodular irons are belonged to a group of cast iron in which most of the carbon crystallizes as spherical particles known as graphite nodules. Remaining carbon combines with iron and chromium to form hard carbide which precipitates during the solidification to form the socalled mottled structure. Matrix of nodular iron rolls is ferritic and pearlitic which provides toughness and strength required in rolling operations. Wide range of properties may be obtained by adjusting the three major alloying elements: chromium, nickel, and molybdenum. The low nickel grade provides optimal hardness with high strength and toughness which makes it suitable for roughing and intermediate rolling. The medium nickel grade has higher surface hardness necessary for intermediate and finishing. High nickel and molybdenum grade provide excellent mechanical properties at high working temperature in terms of strength, toughness, and hardness. Beam blanks Roughing Billets 2 and 3 High Medium section 2 and 3 High Bar and wire rod 2 and 3 High Microstructure 1 Ferritic and pearlitic matrix with small primary carbides and spheroidal graphite. T8X (- HSC) ( ) BARREL ~ ~ 65.3 ~ ~ 21.2 ~.6 1 ~ 1 JOURNAL 33 ~ 45 ~ 65.2 ~ ~ 21.2 ~.6 1 ~ 1 T8X S 45 ~ 3.2 ~ ~ ~.6.8 MAX.2 MAX.8 ~ ~.5.2 ~.5

7 THAI TECH STEEL (13) CO.,LTD. NODULAR CAST IIRON ((T8A, T8AM)) Nodular irons are belonged to a group of cast iron in which most of the carbon crystallizes as spherical particles known as graphite nodules. Remaining carbon combines with iron and chromium to form hard carbide which precipitates during the solidification to form the socalled mottled structure. Matrix of nodular iron rolls is fine pearlite which provides toughness and strength required in rolling operations. Wide range of properties may be obtained by adjusting the three major alloying elements: chromium, nickel, and molybdenum. The low nickel grade provides optimal hardness with high strength and toughness which makes it suitable for roughing and intermediate rolling. The medium nickel grade has higher surface hardness necessary for intermediate and finishing. High nickel and molybdenum grade provide excellent mechanical properties at high working temperature in terms of strength, toughness, and hardness. Microstructure 1 Fine pearlite matrix with small primary carbides and spheroidal graphite. Product Plate Beam blanks Bar and wire rod Medium section Light section Type of Mill Position T8A(55-65 HCS.),T8AM (55- ) ( ) BARREL 55 ~ 72 ~.1 ~ ~.1 ~.4 1 JOURNAL ~ ~.1 ~.8 12 ~.2 ~.4 1 T8A S 55 ~ ~ ~ ~.6.8 MAX.2 MAX 2. ~ ~.5.2 ~.5 T8AM S 55 ~ 3.2 ~ ~ ~.6.8 MAX.2 MAX 2. ~ ~.6.4 ~.8

8 THAI TECH STEEL (13) CO.,LTD. NODULAR CAST IIRON ((TH8AM)) Nodular irons are belonged to a group of cast iron in which most of the carbon crystallizes as spherical particles known as graphite nodules. Remaining carbon combines with iron and chromium to form hard carbide which precipitates during the solidification to form the socalled mottled structure. Matrix of nodular iron rolls is sorbite and bainitic which provides toughness and strength required in rolling operations. Wide range of properties may be obtained by adjusting the three major alloying elements: chromium, nickel, and molybdenum. The low nickel grade provides optimal hardness with high strength and toughness which makes it suitable for roughing and intermediate rolling. The medium nickel grade has higher surface hardness necessary for intermediate and finishing. High nickel and molybdenum grade provide excellent mechanical properties at high working temperature in terms of strength, toughness, and hardness. Microstructure 1 Sorbite and bainite matrix with small primary carbides and spheroidal graphite. CORE STRUCTURE Bar and wire rod Medium section Light section FC : Pearlite matrix with flake graphite FCD : Pearlite matrix with nodular graphite 1 Static casting TH8AM (-72 HSC) 1 1 Centrifugal casting ( ) BARREL ~ 72 ~.1 ~ ~.1 ~.4 1 JOURNAL ~ ~.1 ~.8 12 ~.2 ~.4 1 TH8AM S/C ~ ~ ~ ~.7.8 MAX.2 MAX 2.9 ~ ~ ~.9

9 THAI TECH STEEL (13) CO.,LTD. Nodular irons are belonged to a group of cast iron in which most of the carbon crystallizes as spherical particles known as graphite nodules. Remaining carbon combines with iron and chromium to form hard carbide which precipitates during the solidification to form the socalled mottled structure. Matrix of nodular iron rolls is acicular which provides toughness and strength required in rolling operations. Wide range of properties may be obtained by adjusting the three major alloying elements: chromium, nickel, and molybdenum. The low nickel grade provides optimal hardness with high strength and toughness which makes it suitable for roughing and intermediate rolling. The medium nickel grade has higher surface hardness necessary for intermediate and finishing. High nickel and molybdenum grade provide excellent mechanical properties at high working temperature in terms of strength, toughness, and hardness. Beam blanks Medium section Light section Bar and wire rod NODULAR CAST IIRON ((T8AC)) 2 and 3 High Roughing, Static casting ( ) Microstructure 1 Acicular matrix with small primary carbides and spheroidal graphite. FC : Pearlite matrix with flake graphite CORE STRUCTURE FCD : Pearlite matrix with nodular graphite Centrifugal casting BARREL ~ 75 ~.2 ~.4 12 ~ 15.2 ~.4 1 JOURNAL 45 ~ 58 ~ 75.2 ~.5 12 ~ 15.4 ~.8 1 T8AC S/C ~ ~ ~ ~ 1..5 MAX.2 MAX 2.8 ~ ~.8.6 ~ 1.

10 THAI TECH STEEL (13) CO.,LTD. This roll grade uses iron with high nickel content together with chromium and molybdenum to produce a hard, wear-resisting surface with a combination of tough core which can be produced by static or centrifugally casting. Indefinite chill differs from definite chill in the graphitization of carbon in the microstructure which improves the resistance to firecracking while the remaining free carbide still provides the necessary hardness for wear resistance. Matrix of alloy indefinite chill can be controlled varying from fine pearlite, bainite, martensite or a combination matrix by adjusting chemical compositions. They are suitable for hot rolling of flat products such as intermediate and finishing of plates and strips. Plate 2and4 High Strip 4 High Light Section Bar and wire rod ALLOY IINDEFIINIITE CHIILL Microstructure 1 SHELL STRUCTURE Pearlite Martensite & Bainite matrix with primary carbide. CORE STRUCTURE FC : Pearlite matrix with flake graphite FCD : Pearlite matrix with nodular graphite T7IC Indefinite chill (-83 ) 1 1 ( ) BARREL ~ ~ 55.2 ~.5 1 ~ 15.1 ~.3 1 JOURNAL 35 ~ ~ 25 / ~.2 ~.6 6 ~ 8 / 13 ~ 17.1 ~.5 11 / 1 T7IC S ~ ~ ~ ~ MAX.4 ~.7 1. ~ 4..8 ~ ~.5 *T7X C ~ ~ MAX.3 ~ MAX.4 ~.7 1. ~ 2..7 ~ 1.. ~.3 *T7A C 65 ~ 3. ~ MAX.3 ~ MAX.4 ~ ~ ~ ~.5 *T7B C ~ ~ MAX.3 ~ MAX.4 ~.7 3. ~ ~ ~.5 *T7C C 75 ~ ~ MAX.3 ~ MAX.25 ~ ~ ~ 2..3 ~.5 *T7xx Core is gray cast iron *TW7xx Core is ductile cast iron

11 THAI TECH STEEL (13) CO.,LTD. ALLOY DEFIINIITE CHIILL This roll grade obtains white cast iron at the surface layer by controlling chemical components such as nickel and chromium. The superior high hardness from carbide provides excellent wear resistance required in finishing of strip, wires, and bars. Strength and hardness of materials in this grade can be adjusted by chemical compositions and type of matrix which ranges from pearlite, bainite to martensite. Microstructure 1 SHELL STRUCTURE Strip 4 High Bar and wire rod Pearlite Martensite & Bainite matrix with primary carbide no graphite. CORE STRUCTURE Definite chill FC : Pearlite matrix with flake graphite FCD : Pearlite matrix with nodular graphite ( ) BARREL 65 ~ ~ 35.1 ~.3 8 ~ 12.1 ~.2 1 JOURNAL 35 ~ ~ 25 / ~.2 ~.6 6 ~ 8 / 13~17.1 ~.5 11 / 1 *T6X C 65 ~ 3.1 ~ ~.5.2 ~.3.2 MAX.5 MAX 1. ~ 2..3 ~.5 <.15 *T6A C ~ ~ ~.4.2 ~.4.2 MAX.5 MAX 1.5 ~ 2..5 ~.7 <.15 *T6B C 72 ~ ~ ~.5.2 ~.4.2 MAX.5 MAX 2.5 ~ ~ 1.3 <. *T6C C 77 ~ ~ ~.8.3 ~.5.2 MAX.5 MAX 2.5 ~ ~ 1.5 <.35 *T6xx core is gray cast iron *TW6xx core is ductile cast iron

12 THAI TECH STEEL (13) CO.,LTD. CHROMIIUM IIRON ROLLS ((T2HC)) High chromium iron rolls are composite rolls manufactured by centrifugal or spin casting technique. Since chromium carbide is higher in hardness than ferrous carbide, these rolls exhibit high hardness and wear resistance contributing to their excellent performance. Exhibited throughout their use, these rolls can be used in early finishing stands in strip mills. High chromium iron rolls are spin cast. The high spinning speed creates a centrifugal force to push the molten metal to fill the mold. Vertical casting technology provider excellent bonding between dissimilar shell and core metals. These double poured rolls have high wear resistance properties. s for these rolls include all early finishing stands in both hot and cold strip mills, initial finishing stands of plate mills and skin pass mill, and plate finishing stands Plate 4 High Initial stand and skin pass mills Wide Strip 4 High stand in booth hot and cold strip mills. Tubes Sizing All Beams universal Horizontal sleeve Microstructure 1 SHELL STRUCTURE Primary chromium carbides acicular with fine globular carbides. CORE STRUCTURE FC : Pearlite metrix with flake graphite HSC 1 1 FCD : Pearlite metrix with nodular graphite 1 T2HC(65-85 HSC) 1 ( ) BARREL 65~85 65~75 21 / JOURNAL 35~ / - 11 / 1 T2HC C ~3..5~1.1.7~1.5.2 MAX.5 MAX.7~ ~..7~3.

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