Market Forms

Steel may be obtained in most of the forms adopted for wrought iron, and described at page 284. Angle and T of all sizes up to 4 inches x 4 inches are easily obtained, but many sections in the market beyond that size are made.

Relative Value Of Different Kinds Of Steel

The following extract from one of Messrs. Boiling and Lowe's price lists for July 1885 is given to show the prices of different descriptions of steel as compared with those of iron (see p. 290): -

1 Matheson, M.I.C.E., vol. lxix. p. 21.

2 In this country Board of Trade rules restrict the working stress on steel in bridges to 61/2 tons per square inch.

Per ton.

Per ton.

Per cwt.

Per cwt.

Bars

7

17

6

to

8

17

6

Double shear .

2

5

0

to

3

5

0

Plates

8

5

0

,,

9

5

0

Single

1

14

0

,,,,,

3

0

0

„ boiler quality

9

5

0

,,

10

5

0

Borer steel Cast steel for

1

8

0

,,

3

15

0

Sheets

9

0

0

,,

10

10

0

turning tools

1

18

0

,,

3

5

0

Hoops1 .

9

0

0

,,

10

0

0

Special die steel

4

0

0

,,

5

12

0

Angles

7

0

0

,,

8

0

0

„ tool

Tees

8

10

0

,,

10

10

0

steel

5

12

0

..

..

Bulbs

7

10

0

,,

9

0

0

Cast steel plates

Bulb tees

8

0

0

,,

10

0

0

and sheets ' .

1

0

0

,,

2

10

0

Iron hoops . . . 1 in. by 18 WG. 11/8 in. by 17 WG. 11/4 in. by 16 WG.

Equal strength in steel . 7/8 „ 20 „ 1 „ 20 „ l1/8 „ 19 ,,

Iron hoops . . . 1$ in. by 15 WG. 13/4 in. by 14 WG.

Equal strength in steel . l1/4 „ 18 ,, 13/8 „ 17 .

Steel bars (Bessemer or Siemens-Martin process) can be made in the following sizes : - Bounds. 1/4 in. to 3 in., advancing by 1/16 in. 3 in. to 4 in., advancing by 1/8 in. 4 in.

to 6 in., by 1/4 in. Squares. 1/4 to 31/4 in., advancing by 1/16 in., and 31/2, 33/4, and 4 in. Flat bars. 1 in. to 2 in., advancing by 1/8 in. Thickness, 1/8 in. to 3/8 in. 21/4, 23/8, 21/2, 25/8, 23/4, 3, 31/4, 31/2, 33/4 in. Thickness, 3/16 to 1 in. 4 in., 41/2 in. Thickness, 3/16 to 11/4 in.

5, 51/4, 51/2, 53/4, 6, 61/4, 61/2, 7, 8, 9, 10 in. Thickness, 1/4 to 11/4 in. Steel hoops, 7/8 in. to 3 in. wide, advancing by 3 in. Thickness, usual gauges. Steel plates. 1/16 in. thick can be rolled 28 super, ft. Max. length, 14 ft. Max. width, 4 ft. 3/32 ,, ,, 31 „ „ 18 ,, „ 41/2 ,,

1/8 ,, ,, 40 ,, ,, 22 „ ,, 5 „

5/32 ,, ,, 50 „ ,, 25 ,, ,, 5 1/4 ,,

3/16 ,, ,, 65 „ ,, 60 „ ,, 5 1/2 ,,

1/4 ,, ,, 72 ,, „ 33 „ ,, 6 „

5/16 „ „ 75 „ „ 35 ,, ,, 61/4

3/8 ,, ,, 85 „ „ 38 6 1/2„

7/16 ,, ,, 98 ,, ,, 40 „ ,, 7 „

1/2 ,, „ 105 „ „ 40 „ „ 7 1/2„

5/8 ,, „ 115 „ „ 40 „ „ 81/4„

3/4 ,, ,, 125 „ ,, 37 ,, „ 8 3/4 ,,

1 „ „ 125 „ „ 31 „ „ 8 3/4„

11/8 ,, „ 110 „ „ 28 „ „ 8 3/4„

11/4 ,, ,. 110 „ „ 25 „ „ 8 3/4„

Other sizes can be made by special arrangement.

Extras On Steel Plates

The following list gives the extras upon steel plates, but steel is generally sold to specification, as so much depends upon the proportion of different sizes : -

Limit.

Extra.

Weight, 18 cwts.

10s. per cwt. or part.

Length, 23 feet.

5s. per foot or part.

Width, 5 feet.

10s. for every 3 inches or part under 12 inches.

Area, 80 square feet.

1s. per foot or part.

„ 40 square feet per 3/16".

,, ,,

Thickness, 1/4" to 1".

Under 1/4" and not thinner than 3/16, 10s. per ton.

Sketch plates.

10 per cent allowed. Above 10 per cent 20s. per ton. (9" taper allowed before counting as sketch.)

Butt straps are included without extra charge. Plates not rectangular to be counted as such for overweight and area. A margin of 5 per cent, i.e. 21/2 per cent over or under calculated weight, to be allowed for rolling.