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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
Principal hardening agent (Element)
Carbon
26
Combines with sulphur to offset brittleness (Element)
Manganese
27
Improves oxidation resistance
Silicon
28
Improves machining quality’s (0.1 to 0.15%)
Sulphur
29
Improves atmospheric corrosion resisting properties
Copper
30
Improves strength, corrosion resistance and machinability
Phosphorus
31
Refines grain structure during heat treatment increases toughness and hardenability
Vanadium
32
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.
Low alloy steel
33
Low carbon steel (less than .20% carbon) Less than 2 % total allot content Increase mechanical properties Better strength to weight ratio
High strength low alloy
34
E8018-B smaw electrode is…
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
AWS E8018-B2
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
8018 suffixes A, B, C, D, G, M, NM
A - carbon molybdenum B - chromium molybdenum C - nickel D - manganese molybdenum G - general M - military NM - nickel molybdenum
37
Who are the two organizations that designate filler materials
CSA and AWS
38
Any SAE designation number that the first digit is greater than one means
It’s an alloy steel
39
Red hardness Ability to maintain shape while hot
Tungsten
40
Aluminum is used for what purpose when added to steel
Deoxidizer Makes steel stronger
41
Corrosion resistant High temp service Stainless min 10 % Increase strength
Chromium
42
Second most imp metal in stainless Good at hot and cold temp Tensile strength 6,000 psi for each 1 % of …
Nickel
43
Increase hardness Endurance Creep (the slow stretching of a steel under stress at high temp)
Molybdenum
44
Alloy in steel always present and helps with machining
Sulpher
45
High strength High heat resistance
Cobalt
46
B pressure test
6” diameter Sched 80 carbon steel pipe P1 material group
47
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
Phosphorus
48
In the AWS classification system for low alloy electrodes what identifies the specific additions for alloys
The suffixes
49
Which governing body writes specifications for structural steel shapes and plates
ASTM American society for testing materials
50
4 common types of low alloy steels
Nickel Chromium Nickel chromium Molybdenum
51
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
Sulphur
52
What is indicated by the first digit in the SAE or AISI numbering system
Class of steel
53
Steel does not require pre heat at room temp, excellent weldability
Low carbon
54
The slag of an E10018 is similar to the slag of which electrode
E7018
55
Oxidation resistant Prevents atmospheric corrosion Reduces hot shortness (not be brittle)
Silicon
56
Meant to offset hot shortening (brittle at high temp)
Manganese
57
Pressure vessels uses the p number system
ASME
58
Titanium
Deoxidizer
59
CSA type A material states that the material
Atmospheric corrosion resistant weldable steel
60
CSA type G material states that the material
General construction steel
61
Why is it important to let weld cool slowly when welding on med high carbon steel
Hydrogen induced cracking is possible
62
If you have to weld very high carbon steel where is the weld going to be most susceptible to cracking
First pass and heat affected zone beside the weld
63
What is the main element in carbon steel
95 % iron

Second Year Welding (13 decks)

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