Stainless steel practice problem - Edwards @ Wiki

1 Types and properties of stainless steel

Question 1.1 Chemical symbol

1. Chemical symbol: C: Carbon

Question 1.2 Chemical symbol

1. Chemical symbol: Ni: Nickel

Question 1.3 Chemical symbol

1. Chemical symbol: Cr: Chromium

Question 1.4 Chemical symbol

1. Chemical symbol: Mo: Molybdenum

Question 1.5 Chemical symbol

1. Chemical symbol: Nb: Niobium

Question 1.6 Definition of stainless steel

1. Including Ni or Cr to improve corrosion resistance
2. Generally Cr is 10.5 [\%] or more

Question 1.7 Corrosion resistance guidance

1. Improve corrosion resistance by forming Cr passive film

Question 1.8 SUS 304 (Cr steel 8 [\%] & Ni 8 [\%]) magnetic flux characteristics

1. Non magnetic flux characteristics

Question 1.9 Stainless steel classification excerpt

1. Ferritic stainless steel

Question 1.10 JIS of martensitic stainless steel: abbreviation

1. SUS 410

Question 1.11 JIS of ferritic stainless steel: abbreviation

1. SUS 430

Question 1.11 JIS of ferritic stainless steel: abbreviation

1. SUS 430

Question 1.12 JIS of austenitic stainless steel: abbreviation

1. SUS 304

Question 1.13 JIS of austenite · ferritic stainless steel: abbreviation

1. SUS 329 J 1

Question 1.14 Stainless steel component classification

1. Ferrite type: Cr: 18 [\%]

Question 1.15 Stainless steel component classification

1. Austenitic type: Cr: 18 [\%] Ni: 8 [\%]

Question 1.16 Stainless steel component classification

1. Martensitic type: Cr: 13 [\%]

Question 1.17 Stainless steel component classification

1. Austenite · Ferrite type: Cr: 25 [\%] Ni: 4.5 [%] Mo: 2 [\%]

• stainless steel
  • SUS 304: Austenitic type: Cr: 18 [\%] Ni: 8 [\%]
  • SUS 430: Ferrite type: Cr: 18 [\%]
  • SUS 410: Martensitic type: Cr: 13 [\%]
  • SUS 329 J 1: Austenite · Ferrite type: Cr: 25 [\%] Ni: 4.5 [%] Mo: 2 [\%]

Question 1.18 SUS 304: SUS 304: Properties of austenitic stainless steel

1. High temperature strength
2. Low temperature toughness
3. Molding process characteristics
4. Weld characteristics
5. Selected for wide use

Question 1.19 SUS 304: Austenitic type: omission

Question 1.20 Properties of martensitic stainless steel

1. Inferior weld characteristics
2. Attract cracks in the heat affected zone to quench hardening properties

Question 1.21 Properties of ferritic stainless steel

1. Suppression of hardening against rapid cooling from high temperature
2. Increase crystal grain from 900 [^ {circ} C] to 1000 [^ {circ} C] or higher
3. Attract embrittlement at room temperature

Question 1.22 Properties of ferritic stainless steel

1. Suppression of hardening against rapid cooling from high temperature
2. Increase crystal grain from 900 [^{circ}C] to 1000 [^{circ}C] or higher
3. Attract embrittlement at room temperature

Question 1.23 Electrical characteristics of stainless steel

1. Austenitic stainless steel: electric resistance is 5 times that of carbon steel

Question 1.24 Thermal expansion coefficient of stainless steel

1. Austenitic stainless steel: thermal expansion coefficient to carbon steel:
   approx 1.5 times: crack induced against cooling

Question 1.25 Thermal conductivity of stainless steel

1. Austenitic stainless steel: Thermal conductivity for carbon steel:
   approx \frac{1}{3} [\%]: easy to keep heat

Question 1.26 Density of stainless steel

1. Stainless steel: density to carbon steel: approx \frac{1}{2} [\%]: lightweight

Question 1.27 Magnetism in Solubilization Heat Treatment State

1. Austenitic stainless steel: Nonmagnetic properties

Question 1.28 SUS 304: Grain boundary corrosion formation transition
of austenitic stainless steel

1. Heating from 500 to 800 [^{\circ}C]
2. C dissolved in supersaturated state (mutual dissolution of plural elements) precipitates
   as Cr carbide
3. Cr mixed concentration near the grain boundary decreases
4. In addition to corrosion resistance of Cr alone,
   selective corrosion of grain boundaries for use in corrosive environments

Question 1.29 Defect countermeasure for stainless steel welding

1. Supports Ti and Nb and suppresses intergranular corrosion by mixing with carbon

Question 1.30 Defect countermeasure for stainless steel materials

1. Reduction of C reduces generation
   of Cr carbide and improves corrosion resistance capability

Question 1.31 Magnetic properties in stainless steel materials

1. 8 [\%] or more in austenitic stainless steel
   Magnetic properties disappear due to mixing of Ni

Question 1.32 Countermeasure against corrosion in stainless steel materials

1. Improve corrosion resistance by mixing 10.5 [%] or more Cr with steel

Question 1.33 Additive element of SUS 430 Main component

1. Cr: 18 [\%]

Question 1.34 Additive element of SUS 304 Main ingredient

1. Cr: 18 [\%] - Ni: 8 [\%]

Question 1.35 Addition of SUS 310 S Main component of mixed element

1. Cr: 25 [\%] - Ni: 20 [\%]

Question 1.36 Additive element of SUS 410 Main ingredient

1. Cr: 13 [\%]

Question 1.37 JIS standard name

1. 18 Cr steel: SUS 430

Question 1.38 SUS 304 L

1. C content to 0.030 [\%] or less to prevent precipitation of Cr carbide

Question 1.39 Austenitic stainless steel Example: SUS 304

1. Cr: 18 [\%] - Ni: 8 [\%]

Question 1.40 Austenitic stainless steel Example

1. SUS 316: Improve corrosion resistance capability by adding Mo

Question 1.41 Austenitic stainless steel Example

1. SUS 321: Prevention of precipitation of Cr carbides by addition of Ti

Question 1.42 Etymology of stainless steel in the JIS symbol

1. SUS: Steel Use Stainless

Question 1.43 Stainless substance in JIS symbol

1. SUS: Steel - Use - Stainless

Question 1.44 Stainless substance in JIS symbol

1. SCS: Steel - Casting - Stainless

Question 1.45 Mixture notation in numerical values after SUS and SCS in JIS symbol

1. 4**: Cr series

Question 1.46 JIS symbol The etymology at the end of the string

1. L: low carbon

Question 1.47 Etymology of JIS symbol string

1. CP: Cold rolled steel plate

Question 1.48 Etymology of JIS symbol string

1. HS: Hot rolled steel strip

Question 1.49 Etymology of JIS symbol string

1. B: Bar (Square bar & Round bar)

Question 1.50 Corrosion of stainless steel

1. Gap corrosion: corrosion between materials due to ions

Question 1.51 corrosion of stainless steel

1. Stress corrosion cracking: cracks caused by tensile stress
   in combination with ionic corrosion elements

Question 1.52 Corrosion of stainless steel

1. Pitting corrosion: perforated corrosion in ionic corrosion environment

Question 1.53 Corrosion of stainless steel

1. Intergranular corrosion: corrosion occurring
   along the crystal grain boundary in the joint forming part

Question 1.54 Corrosion countermeasure

1. Gap corrosion: induced due to poor welding or non-adhesion of relics in mutual joining

Question 1.55 Corrosion countermeasure

1. Intergranular corrosion: By using low-carbon stainless steel or adding Ti and Nb

Question 1.57 Corrosion countermeasure

1. Stress concentration cracking: stress relief heat treatment suppresses thermal stress and strain

Question 1.58 High temperature oxidation

1. Drying: Formation of coated oxide on the surface against red heat of the atmosphere in the atmosphere Peeling phenomenon

Question 1.59 Characteristics of ferritic stainless steel
Good mechanical properties at high temperature
Good oxidation resistance performance
Steel crystals coarsened from 900 to 1000 [^{\circ} C] to increase the brittleness

Question 1.60 Characteristics of ferritic stainless steel

1. 1. Good mechanical properties at high temperature

Good oxidation resistance performance

1. Steel crystals coarsened from 900 to 1000 [^ {\ circ} C] to increase the brittleness