SPECIAL STEEL SHEET - JFEスチール株式会社

1 SPECIAL STEEL SHEET . SPECIAL STEEL SHEET . East Japan Works (Chiba). Contents JFE STEEL Corporation 1. produces various types of 2. SPECIAL STEEL sheets under an Manufacturing 3. Applicable 4. integrated quality control Surface finish and heat 4. system using modern Chemical 5. facilities mainly in Chiba Available product size 6. and Keihin Area of East Dimensional 7. Japan Works. JFE's SPECIAL Mechanical properties by heat 8. STEEL products support Effect of chemical 9. technical innovation and Introduction of functional products improved productivity at 10. Hardness conversion 12. customers, and have won Unit mass per 12. an excellent reputation Instructions for ordering .. 13. for high dimensional accuracy, quenchability, and workability.

2 SUPERHOT is a trademark of JFE STEEL Corporation registered in Japan. SPECIAL STEEL SHEET . Characteristics 1. Uniform quality Integrated operation control and highly computerized production processes ensure a high level of uniformity in product quality. 2. High dimensional accuracy and excellent surface quality JFE's production plants boast some of the world's most advanced steelmaking, hot rolling, and cold rolling equipment, ensuring high dimensional accuracy and outstanding surface quality. 3. Wide product line A wide range of STEEL grades and product dimensions are available to meet diverse customer requirements. 4. Strict quality control and inspection system All products can be used with confidence thanks to scientific quality control and strict Characteristics testing and inspection.

3 (JFE's STEEL SHEET production system is certified under ISO 9001.). East Japan Works (Keihin). 1. SPECIAL STEEL SHEET . Application Chains Carbon steels for machine structure Automotive clutch parts Chain parts Automotive seat belt parts Springs and washers Sprocket gears Automotive AT parts Gears Alloy steels for machine structure Automotive reclining seat gear parts Application Door lock parts Shock absorber Circular saw blades Alloy tool steels Knives Hand saws Tools Hose bands, SHEET springs Carbon tool steels Razor blades Needles Springs Measures Bearing parts 2. SPECIAL STEEL SHEET . Manufacturing process Steelmaking Continuous 1 (Converter) 2 casting Slab Continuous caster The finishing trains have applied pair-cross mill (The most modern mill with freely changeable roll gap widthwise) and most modern thickness 3 Hot rolling control system.

4 Following characteristics of products are achieved. High dimensional accuracy (Thickness tolerance of with SUPERHOT). Excellent surface quality Uniform mechanical properties Manufacturing process Non pickled hot rolled coil Finishing train (Pair-cross mill). Rougher Hot rolling mill Pickled product 4 Pickling 5 Annealing Annealed product 4 Shot blasting hot rolled coil without scale Shot blasted product 6 Cold rolling 7 Annealing 8 Skinpassing Cold rolled product Cold rolling mill Cold rolled coil 3. SPECIAL STEEL SHEET . Applicable standard Classification Standard Designation Carbon steels for machine structual use S-C. Alloy steels for machine structual use SMnC, SCr, SCM, SNCM. Carbon tool steels SK. hot rolled Alloy tool steels SKS.

5 STEEL SHEET Spring steels SUP. High carbon chromium bearing steels SUJ. Carbon Steels SAE. Alloy Steels SAE. Cold rolled SPECIAL STEEL strip S-CM, SK-M. Carbon steels for machine structual use S-C. Cold rolled Carbon tool steels SK. STEEL SHEET Alloy tool steels SKS. Carbon Steels SAE. Applicable standard/Surface finish and heat treatment Surface finish and heat treatment hot rolled STEEL SHEET Surface Annealing Remarks hot rolled coils are annealed with scale. Decarburized layer is generated at surface. Suitable for Yes Non applications which needs grinding. pickled No As hot rolled with scale. Hardness because not annealed. Availability of working is subject to negotiation. hot rolled and annealed after descaling at pickling line.

6 Attractive surface and very little decarburized Yes layer. Pickled Descaled at pickling line. Comparatively soft material suitable to applications which require no working or No will be annealed by customers. hot rolled and annealed after descaling by shot blasting. Suitable for applications which require rough Yes Shot surface finish and for thicker gauge which can not be pickled. blasted Mechanically descaled by shot blasting. Rough finish surface and hardened surface. Suitable for punch No working. Cold rolled STEEL SHEET Surface Annealing Remarks Carbon is spheroidized by annealing after cold rolling. Bright finish at skinpass after annealing with Yes Bright bright finish rolls. finish No As cold rolled . Suitable for applications which require annealing by customer.

7 Bright finish at cold rolling. Yes Spheroidized by annealing after cold rolling. Dull finish by skinpass rolling after annealing. Dull finish No As cold rolled with dull finish at cold rolling. Has advantage of less risk of defects than in bright finish. 4. SPECIAL STEEL SHEET . Chemical composition Designation Chemical composition (%). Classification JIS SAE C Si Mn P S Cu Ni Cr Ni+Cr Mo V. S20C S35C(M) S45C(M) S50C(M) SAE1050 S55C(M) SAE1055 Carbon STEEL S60CM SAE1060 S65CM SAE1065 S70CM SAE1070 Chemical composition SAE1074 S75CM Mn STEEL SAE1541 Mn-Cr STEEL SMnC443 Cr STEEL SCr420 SCM415 Cr-Mo STEEL SCM420 SCM435 SNCM220 Ni-Cr-Mo STEEL SAE8620 SK85 (M) Carbon tool STEEL SK95 (M) SKS5 Alloy SKS51 tool STEEL SKS81 SUP10 Spring STEEL SAE6150 High carbon SUJ2 Cr-bearing STEEL - Remarks - 1.

8 (M) means the order as cold rolled SPECIAL STEEL strip is possible. 2. Si in SAE standard is if not specified. 3. The standards not specified above, or SPECIAL chemical compositions freely come to negotiation. 5. SPECIAL STEEL SHEET . Available product size range hot rolled STEEL SHEET Available range of HR. Available range of shot blasted Available range of pickled SK85 S45C. 900 1100 12 900. 800. 10 1200. 1100 Thickness (mm). Thickness (mm). 1150. 850. 1100.. 1150. 1200. 1200. Available product size range 1100. 780 1000 730 1200. 700 900 1100 1300 700 900 1100 1300. Width (mm) Width (mm). Cold rolled STEEL SHEET Available range of CR. SK85, SAE1065 SK95. 1050. Thickness (mm). Thickness (mm). 1000. 850. 850 700 900 1100 1300 700 900 1100 1300.

9 Width (mm) Width (mm). Reference . The standards not specified above and sizes outside the available area are subject to negotiation. 6. SPECIAL STEEL SHEET . Dimensional tolerance hot rolled STEEL SHEET Basic standard is JIS G 3193 (Dimension, mass and permissible variation of hot rolled STEEL plates, sheets and strip). For high thickness accuracy, SUPERHOT tolerance can be applied (see figure). JIS G 3193. Strip thickness tolerance (mm). SUPERHOT. Dimensional tolerance 0 1 2 3 4 5 6 7 8 9 10 11 12 13. Strip thickness (mm). Cold rolled STEEL SHEET Basic standard is JIS G 3141(Cold rolled STEEL coils and strips). For high thickness accuracy, JIS G 3311 (Cold rolled SPECIAL STEEL strip ) can be applied. JIS G 3141. Width 1000mm Strip thickness tolerance (mm).

10 JIS G 3141. Width <1000mm JIS G 3311 A. 0 Strip thickness (mm). 7. SPECIAL STEEL SHEET . Mechanical properties by heat treatment Relation between hardness and Relation between strength and cold reduction [C] contents of hot rolled STEEL (Material: spheroidizing annealed). 100 SAE1065. Hardness (HRB). 800 Hardness 100. Tensile strength (N/mm2). 90 S50C. 700. Hardness (HRB). 80 90 S35C. Tensile strength 600. 500. 80. 400. 0 20 40. Carbon content (%) Cold reduction (%). Relation between hardness and quenching condition (As- hot rolled ). Mechanical properties by heat treatment Relation between hardness and Relation between hardness and quenching temperature holding time Holding for 30 min then oil quench Oil quenching from 850C.