Api 571

Front 1

Temper embrittlement causes a loss of

Back 1

Toughness at low temperatures

Front 2

Temper embittered occurs because of

Back 2

Long term operation between 650 and 1100°

Front 3

The primary metallurgy that is affected by temper embrittlement is

Back 3

2 1/4 chrome

Front 4

The metallurgical change that occurs during temper embrittlement can be confirmed by

Back 4

Impact testing

Front 5

The effects of temper embrittlement can be reversed by

Back 5

Heating to 1150°f and rapidly cooling

Front 6

A brittle fracture is caused by

Back 6

Stress cycles

Front 7

Which material is least affected by brittle fracture

Back 7

300 SS

Front 8

2 things that increase the likelihood of brittle fracture

Back 8

Large grain size, thicker materials

Front 9

What test is used to determine a materials toughness

Back 9

Charpy impact test

Front 10

Most brittle failures appear as

Back 10

Cleavage

Front 11

Thermal fatigue is caused by

Back 11

Cyclic stresses that come from temperature variations

Front 12

Thermal fatigue becomes of concern if temperature swings exceed

Back 12

+-200°f

Front 13

Thermal fatigue cracks usually initiate

Back 13

On the surface of the component

Front 14

Mechanical fatigue is caused by

Back 14

Cyclic stresses occurring over a long period of time

Front 15

Fatigue will not occur in carbon steel if stresses are below the

Back 15

Endurance limit

Front 16

What material does not have an endurance limit

Back 16

Stainless steel

Front 17

The endurance limit is usually about

Back 17

40-50% of a materials ultimate tensile strength

Front 18

CUI is an inspection concern for insulated vessel that operate at 500°F

Back 18

Is in intermittent service

Front 19

CUI on carbon steel or low alloy materials appears as

Back 19

Localized pitting or localized wall loss

Front 20

CUI on 300 SS appears as

Back 20

Cracking , (localized) pitting or wall loss

Front 21

This damage is closely related to cooling water corrosion

Back 21

Fouling

Front 22

And cooling water systems corrosion rates can increase if fluid velocity are

Back 22

Either too high or too low

Front 23

Scaling potential increases and fresh water systems above

Back 23

> 140°f

Front 24

Scaling potential increases in brackish or salt water systems above

Back 24

> 225°f

Front 25

In cooling water systems corrosion rates can increase if velocity decrease below

Back 25

3 fps

Front 26

Corrosion from oxygen in boiler feed water usually creates

Back 26

Isolated pitting

Front 27

Carbon dioxide corrosion usually creates

Back 27

Smooth grooving

Front 28

Sulfidation of iron based alloys usually begin at around

Back 28

500°f

Front 29

Resistance to sulfidation increases as the

Back 29

Chromium content in materials increases

Front 30

Sulfidation is primarily caused by

Back 30

Sulfur compounds decomposing at higher temperatures

Front 31

Sulfidation usually creates

Back 31

Uniform corrosion

Front 32

Chloride stress corrosion cracking can cause cracks that normally initiate

Back 32

On the surface of 300 SS

Front 33

This can contribute to chloride stress corrosion cracking

Back 33

Dissolved oxygen

Front 34

Fluoride stress corrosion cracking usually occurs at a pH

Back 34

Above 2

Front 35

Two factors that contribute to corrosion fatigue

Back 35

Cyclic loading and corrosion

Front 36

Corrosion fatigue often initiates at

Back 36

The bottom of a pit