Strip hot rolling

A 606 Steel sheet and strip hot-rolled steel and cold-rolled, high-strength low-alloy with improved corrosion resistance Not specified Hot-rolled and cold-rolled sheet and strip Atmospheric-corrosion twice that of carbon steel (type 2) or four times of carbon steel (typed) Structural and miscellaneous purposes for which weight savings or added diuabiUty is important... 

The development of a sharp COE texture in the finished strip requires complex control of numerous variables. The conventional commercial process (18) involves hot-rolling a cast ingot at ca 1370°C to a thickness of about 2 mm, annealing at 800—1000°C, and then cold-rolling to a final thickness of 0.27—0.35 mm in two steps of 70 and 50%, respectively, with a recrystallization (800—1000°C) aimeal in between. The cold-roUed strip is decarburized (800°C) to ca 0.003% C in mixtures of wet results in a primary recrystallized stmcture containing grains of the COE... 

Cathodes Hot rolled and cold rolled to produce strip and sheet... 

JSA G 4304, Hot rolled stainless steel plates, sheets and strip. 

A 1-in. X 36-in. (thickness x width) slab enters a hot-rolling mill at 500 feet per minnte. It passes throngh seven stands and emerges as a strip 0.25 in. x 36 in. What is the exit speed of the strip from the last set of rollers ... 

Alloys having 15 to 30 wt % Co and very coarse WC grain sizes (up to 20 Jim) have replaced steel rolls in the production of hot-rolled steel rods. Carbide rolls are also well suited for the cold reduction and finishing of strip products in Sendzimii mills where rigidity and dimensional stability are particularly important. The compositions used in these applications have a 5.5 wt % Co and medium WC grain size (1—2 Jim). 

Several ASTM Standard Specifications have been promulgated for hafnium materials B737-90 for Hot-Rolled or Cold-Finished Hafnium Rod and Wire B776-91 for Hafnium and Hafnium Alloy Strip, Sheet, and Plate G2-88 and G2M-88 (metric) for Corrosion Testing of Products of Zirconium, Hafnium,... 

Continuous casting of filtered molten metal into giant coils (50,000 lb 22,680 kg) of 0.250-inch ( - 6.4 mm) strip. This eliminates all hot rolling and intermediate annealing for rolling thin sheet products, such as foil, container stock, siding, etc. 

Steel sheets, widely used in thousands of products, are produced Irorn slabs from a slabbing mill, continuous casting machine, or pressure-poured molils. These pieces are hot-rolled in a hoi strip mill, descaled bv pickling in an acid solution, and then cold-rolled and tempered m a cold-reduction and temper mill. Tlte cold-tolled snip may he marketed in coil form, or carried to a side-trimming and sheet shearing line, where it is customized lor speeilie user needs. 

As a simple model to illustrate the above variables, consider a surface as shown in Fig. 4.2 consisting of alternate anodic and cathodic strips (e.g., uniform scratches through the oxide coating of a hot-rolled steel... 

Properties. The properties of plain carbon steels are governed principally by carbon content and microstructure. These properties can be controlled by heat treatment as discussed. About half the plain carbon steels are used in the hot-rolled form, although increasingly the property combinations are enhanced by controlled cooling following the last stand of the hot mill for structural shapes, sheet, and strip. The other half are cold-rolled to thin sheet or strip and used direcdy or with an annealing treatment such as described. 

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