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Second Year Welding > Carbon And Alloy Steels > Flashcards

Carbon And Alloy Steels Flashcards

1
Q

Chain, nails, rivets, pipe, screw, wire (which carbon class, low, med…)

A

Low

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2
Q

Bar stock, plate, structural shapes
(Which carbon class low, med..)

A

Mild steel (0.15 - 0.30)

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3
Q

Axles, connecting rods, shafting
(Which carbon class low, med..)

A

Medium

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4
Q

Crankshafts, scraper blades, automotive springs, anvils, band saw blades (which carbon class low, med…)

A

High

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5
Q

Chisel, punches, hand tools, dies, metal cutting saws, files, reamers… (which carbon class low, med…)

A

Very high

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6
Q

Structural steel plate and shapes

A

CSA and ASTM

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7
Q

Steel sheet stock

A

AISI

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8
Q

Steel bar stock

A

SAE and AISI

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9
Q

What is the main purpose of adding chromium to steel

A

Corrosion resistance

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10
Q

Which element provides the best resistance to creep

A

Molybdenum

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11
Q

Which element is best for low temperature service applications

A

Nickel

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12
Q

At what carbon content does preheat become important when welding steel at room temperature

A

Medium carbon

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13
Q

CSA system, 300W means …

A

300 represents the tensile strength in MPa
W represents the type of steel (W means weldable)

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14
Q

SAE and AISI 4 digit designation system meanings …

A

1: major class
2: subclass
3 &4: approx carbon content

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15
Q

ASTM system what does the A stand for

A

Ferrous

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16
Q

The P - numbers in the ASME system are for ..

A

Similar chemical composition
Mechanical properties and weld ability
Help with weld procedures
ASME used same system as ASTM but adds an “S” in front of the “A”

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17
Q

Codes and admin for ASME and CSA

A

CWB and ABSA

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18
Q

What does the suffix QT represent in the CSA steel classification system

A

Quenched and notch tough

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19
Q

What do the last two numbers mean in the SAE designation 1030?

A

Carbon content in the 0.01%

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20
Q

Increasing hardness will sharply ….

A

Decrease ductility

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21
Q

Preheat only necessary if steel is thick or cold

A

Low carbon

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22
Q

Difficult to weld
Preheat and temperature control may be necessary

A

Medium carbon steel

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23
Q

Poor weldability
Preheat, post heat and interphase temperature control critical

A

High carbon steel

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24
Q

Hardly ever welded
Replacements are most likely necessary
Keep penetration as low as possible and use slow travel speeds
First pass will have the highest risk of cracking

A

Very high carbon

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25
Q

Principal hardening agent
(Element)

A

Carbon

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26
Q

Combines with sulphur to offset brittleness
(Element)

A

Manganese

27
Q

Improves oxidation resistance

A

Silicon

28
Q

Improves machining quality’s (0.1 to 0.15%)

A

Sulphur

29
Q

Improves atmospheric corrosion resisting properties

A

Copper

30
Q

Improves strength, corrosion resistance and machinability

A

Phosphorus

31
Q

Refines grain structure during heat treatment increases toughness and hardenability

A

Vanadium

32
Q

Small additions of alloying elements from 2% to just below stainless steel.
Add chemical and mechanical properties.
Better strength to weight ratio than plain carbon steel.

A

Low alloy steel

33
Q

Low carbon steel (less than .20% carbon)
Less than 2 % total allot content
Increase mechanical properties
Better strength to weight ratio

A

High strength low alloy

34
Q

E8018-B smaw electrode is…

A

A low alloy steel welding rod
Alloys will be at least 80,000 psi and have a letter suffix at the end
B represents chromium molybdenum as an addition

35
Q

AWS E8018-B2

A

E- electrode
80 - tensile strength 80,000 psi minimum as welded
1 - all position
8 - lime coated low hydrogen deposit
B2 - chemical composition of the deposited weld metal

36
Q

8018 suffixes
A, B, C, D, G, M, NM

A

A - carbon molybdenum
B - chromium molybdenum
C - nickel
D - manganese molybdenum
G - general
M - military
NM - nickel molybdenum

37
Q

Who are the two organizations that designate filler materials

A

CSA and AWS

38
Q

Any SAE designation number that the first digit is greater than one means

A

It’s an alloy steel

39
Q

Red hardness
Ability to maintain shape while hot

A

Tungsten

40
Q

Aluminum is used for what purpose when added to steel

A

Deoxidizer
Makes steel stronger

41
Q

Corrosion resistant
High temp service
Stainless min 10 %
Increase strength

A

Chromium

42
Q

Second most imp metal in stainless
Good at hot and cold temp
Tensile strength 6,000 psi for each 1 % of …

A

Nickel

43
Q

Increase hardness
Endurance
Creep (the slow stretching of a steel under stress at high temp)

A

Molybdenum

44
Q

Alloy in steel always present and helps with machining

A

Sulpher

45
Q

High strength
High heat resistance

A

Cobalt

46
Q

B pressure test

A

6” diameter
Sched 80 carbon steel pipe
P1 material group

47
Q

In high percentages this element is considered an impurity. Low percentage up to 0.01 % slightly improved strength and corrosion resistance of low carbon steel

A

Phosphorus

48
Q

In the AWS classification system for low alloy electrodes what identifies the specific additions for alloys

A

The suffixes

49
Q

Which governing body writes specifications for structural steel shapes and plates

A

ASTM
American society for testing materials

50
Q

4 common types of low alloy steels

A

Nickel
Chromium
Nickel chromium
Molybdenum

51
Q

The content of this element in carbon steel is usually below 0.05 % but a content of 0.1% to 0.15% can improve machinability

A

Sulphur

52
Q

What is indicated by the first digit in the SAE or AISI numbering system

A

Class of steel

53
Q

Steel does not require pre heat at room temp, excellent weldability

A

Low carbon

54
Q

The slag of an E10018 is similar to the slag of which electrode

A

E7018

55
Q

Oxidation resistant
Prevents atmospheric corrosion
Reduces hot shortness (not be brittle)

A

Silicon

56
Q

Meant to offset hot shortening (brittle at high temp)

A

Manganese

57
Q

Pressure vessels uses the p number system

A

ASME

58
Q

Titanium

A

Deoxidizer

59
Q

CSA type A material states that the material

A

Atmospheric corrosion resistant weldable steel

60
Q

CSA type G material states that the material

A

General construction steel

61
Q

Why is it important to let weld cool slowly when welding on med high carbon steel

A

Hydrogen induced cracking is possible

62
Q

If you have to weld very high carbon steel where is the weld going to be most susceptible to cracking

A

First pass and heat affected zone beside the weld

63
Q

What is the main element in carbon steel

A

95 % iron

Second Year Welding (13 decks)

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