Relatia dintre tratament termic, duritate , prelucrabilitate la unele oteluri de constructie

Grupa oteluri

Tratamentul

termic aplicat

Duritate

HB

Prelucrabilitate *

St

Fz

Rb

Ga

Mr

Fi

Al

Da

Br

Mt

Am

Otel carbon si slab

aliat de cementare

(OLC 10,OLC 15,

OLC 20, 21TCM12,

28TCM12

Laminat, forjat

120-180

A

S

R

R

S

Normalizat la 900-950sC ;

950-1050 sC

140-200

B

B

A

A

A

Recoacere izoterma

cu suprainclzire 950 - 1000sC

140-200

B

B

B

B

R

Oteluri aliate de

cementare

( 15MoMC12,

21MoMC12,

15 CN 15,

13 CN 17 )

Normalizare la

900 - 950 sC

200-250

A

B

S

A

A

Normalizare + re-

venire inalta la

600 - 650 sC

180-220

B

R

R

FR

B

Imbunatatire

220-270

S

B

B

B

R

Oteluri aliate de

cementare

( 13 CN 30 ,

13 CN 35 )

Nornalizare la

900 - 940 sC

250-300

A

S

B

B

R

Normalizare +

revenire inalta la

640 - 680 sC

180-250

B

B

S

A

.

S

Oteluri carbon si

slab aliate de

imbunatatire

(OLC 25, OLC 30,

OLC 35, OLC 40 )

Laminat , forjat

130-170

B

S

A

A

Normalizat la

900 - 950sC

150-180

B

B

B

B

OLC 45,

OLC 50,

40 C 10

Laminat , forjat

170-220

B

B

A

A

Recoacere

complecta

150-180

B

S

S

S

Normalizare

180-230

S

B

B

B

OLC 55,

OLC 60,

50VC11,

65 M 10

Recoacere

completa

180-220

R

R

A

A

Recoacere

incompleta

160-200

B

B

FB

FB

41 Mo C 11

Recoacere

completa

230-280

B

B

A

A

Normalizare +

revenire

inalta

200-240

S

S

B

B

*PRESCURTARI : St -strunjire ; Fz - frezare ; Rb - rabotare ; Ga -gaurit ;

Mr -mortezat ; Fi - filetare ; Al - alezare ; Da -danturare ;

Br - brosare ; Mt - matritare ; Am - ambutisare .

A -acceptabila ; B - buna ; S - satisfacatoare FB -foarte buna ,R -rea; FR-foarte rea.