The hardness and tensile strength in austenitic stainless steel can be increased by

Hardness & tensile strength of austenitic stainless steel can be increased by

A

Martempering

B

Cold working

C

Normalising

D

Hardening

Calculate ultimate moment and shear of effective span is 30m, live load is 9kn/m, dead load excluding self weight is 2kn/m, load factors for dead load is 1.4 for live load is 1.6 cube strength of concrete fcu is 50n/mm2 cube strength at transfer is fci is 35n/mm2, tensile strength of concrete Ec is 34kn/mm2 loss ratio ɳ is 0.85 and 8mm diameter high tensile strength fpu is 1500n/mm2 are available for use and the modulus of elasticity of high tensile wires is 200kn/mm2?

A

340 and 450kn

B

240 and 340kn

C

140 and 240kn

D

100 and 200kn

Compared to mild steel, cast iron has
(i) High compressive strength
(ii) High tensile strength
(iii) Low compressive strength
(iv) Low tensile strength

A

(i) and (ii)

B

(ii) and (iii)

C

(iii) and (iv)

D

(i) and (iv)

Why straight chromium stainless steels and austenitic stainless steels are not recommended for hydrofluoric acid applications?

A

Due to susceptibility to crevice

B

Due to limited corrosion resistance

C

Due to susceptibility to pitting

D

Sensitive to erosion-corrosion

Ferric stainless steels compared to austenitic stainless steels

A

Have lower corrosion resistance

B

Are harder to fabricate

C

Are less ductile and hence less suitable for cold pressing

D

All of the above

Which of the following crystal structures characterises the austenitic stainless steel?

A

Simple hexagonal

B

Body centred cubic

C

Face centred cubic

D

None of these

The main types of stainless steel are Ferritic, Austenitic, Martensitic.

A

True

B

False

What is the crystal structure of Austenitic stainless steel?

A

Face centered cubic structure

B

Body-centered cubic structure

C

Hexagonal close packed structure

D

Simple cubic structure

Which of the following corrosives that induce intergranular corrosion in austenitic stainless steel?

A

Acetic acid

B

Acetic acid+salicylic acid

C

Ammonium nitrate

D

Acetic acid, acetic acid+salicylic acid, ammonium nitrate

Which of the following is/are the methods to control intergranular corrosion of austenitic stainless steel?

A

Employing solution-quenching

B

Adding stabilizers

C

Lowering the carbon content to below 0.03%

D

Employing solution-quenching, adding stabilizers and lowering the carbon content to below 0.03%

The hardness and tensile strength in austenitic stainless steel can be increased by

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