Conventional Steel

Question 1

Types of steel

Answer 1

High carbon steel
Alloy
Malleable
Cast iron

Question 2

High carbon steel

Answer 2

Metal working does, very dense

Question 3

Alloy steel

Answer 3

Gears, shafts, tools, some chains and cables. Less dense than high carbon steel

Question 4

Malleable

Answer 4

Structural beams, railroad track

Question 5

Cast iron

Answer 5

Pipes, brittle

Question 6

Method to destroy steels harder than high carbon/alloy

Answer 6

Thermite, exothermic torch or electrical cutting tools

Question 7

Explosive factors for steel cutting

Answer 7

Type, size and placement of charge. Charge to target contact is the most important factor for steel cutting

Question 8

Type of explosive for steel cutting

Answer 8

Must have an RE factor of 1 or higher. Need a high brisance or shattering effect

Question 9

Direction of initiation is ____ to the target

Answer 9

Perpendicular

Question 10

When charge extends past the flange

Answer 10

Split the charge and place on two sides, offset by thickness of the web

Question 11

I beam, built up girders, steel plates, columns and other structural sections formula

Answer 11

P= 3/8 x A
Or
P= .375 x A

Question 12

High carbon, alloy steel, and bars, rods, chains and cables over 2” in diameter use formula ____

Answer 12

P=D^2

Question 13

Steel bars, rods, chains, and cables up to and including 1” diameter or thickness

Answer 13

Use 1lb TNT

Question 14

Steel bars, rods, chains, and cables between 1” and 2” diameter or thickness

Answer 14

Use 2 lbs TNT

Question 15

If bar, rod, chain or cable is over 3”

Answer 15

Split charge and place on each side, stagger to produce shearing effect

Question 16

Railroad track formula

Answer 16

For 5” or higher rails use 1lb of TNT, typical rail is 7”
For switches and crossovers use 1lb TNT
Less than 5” rails use .5lb TNT
For frogs use 2lbs TNT