. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . de at a iiuich lower cost than even ordinary grades of l)oiler-iron,and it has therefore |)ractically driven the latter out of tlie nuirket. The quality of steel de-sired for boiler and fire-box plates nuiy be seen from the following specifications given by dif-ferent authorities: U7iifpd States iNa/v/.—Sliell: Tensile, ^ to lbs.; elongation, 22 per cent in 8in. transverse section, 25 per cent in 8 in. l
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . de at a iiuich lower cost than even ordinary grades of l)oiler-iron,and it has therefore |)ractically driven the latter out of tlie nuirket. The quality of steel de-sired for boiler and fire-box plates nuiy be seen from the following specifications given by dif-ferent authorities: U7iifpd States iNa/v/.—Sliell: Tensile, ^ to lbs.; elongation, 22 per cent in 8in. transverse section, 25 per cent in 8 in. longitudinal section. Flange: Tensile. r)0,0()0 to58,000 lbs.; elongation, 25 jicr cent in 8 in. Chemical rtiiuiremeiits: Phosphorus, not over BOILERS, STEAM. 57 •035 per cent; sulphur, not over -040 per cent. Cold-bending test: Specimen to stand beingbent flat on itself. Quenching test: Steel heated^ to cherry red, plunged in water 82° F., and in., 20 per cent. Same to be bent around curve one and a half times thickness of the plate. British Admiralfy.—Tm^We. 58,240 to lbs.; elongation in 8cold-bending and quenching tests as United States Navy. Buieau Shell: Tensile, not less than 60,-480 lbs.; elongation in 8 in., 20 per cent; must with-stand after heating to dull red, and being i)lunged intowater of 80° F., being bent until opening betweenends is three times thickness of plate. United States Revenue Jlarine.—Tensile, not lessthan 00,000 lbs.; reduction of area, 50 per cent. American Boiler - 3Jakers Association, — Tensile,55,000 to 65,000 lbs.; elongation in 8 in., 20 per centfor plates | in. thick and under: 22 per cent for platesf in. to f in.; 25 per cent for plates f in. and over. Cold-bending test: For plates | in. thick and under, speci-men must bend back on itself without fracture; forplates over I in. thick, specimen must withstand bending180° around a numdril one and a half times the thicknessof the plate. Chemical requirements: Phosphor
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
