20nicrmo2_uni_7846[1]

Temprabilità Hardenability HRC / % Martensite Diametro temprabile mm./Hardenable diameter mm. olio/oil acqua/water Superficie / Surface 3/4 Raggio dal centro / 3/4 radius from center Centro / Centre Olio poco agitato Slightly stired oil Temprabilità Jominy Jominy hardenability Distanza dall’estremità temprata Distance from quenched end Durezza Rockwell Rockwell hardness Re min. N/mm2 Rm N/mm2 A min. % KCU min. J Ricotto lavorabile / Soft-annealed Ricotto isotermico/Isothermal annealed Ricotto sferoidale/Spheroidal annealed Saggio/Specimen Ø mm. Durezze HB allo stato HB hardness in the following conditions Caratteristiche meccaniche / Mechanicals properties Stato Conditions Corrispondenze Comparable standards Composizione Chemical analysis Temperature per la lavorazione a caldo ed il trattamento termico Hot work and heat treatment temperatures Punti critici Critical point Fucinatura Forging Normalizzazione Normalization Ricottura subcritica Subcritical annealing Ricottura isotermica Isothermal annealing Tempra/Hardening 1° 2° Rinvenimento di distensione Stress relieving 60 55 50 45 40 35 30 25 20 15 1,5 3 5 7 9 11 13 15 20 25 30 35 40 45 50 SIAU DIN W.N. AFNOR BS AISI/SAE HD20 (21NiCrMo2) (1.6523) 20NCD2 (8620) C Mn Si Cr Ni Mo .17÷.23 .60÷.90 .15÷.40 .35÷.65 .15÷.25 P e S ≤ .035 .40÷.70 Ac1 735 650÷700 850÷870 160÷200 Ac3 820 850÷880 840÷890 810÷830 Ms 380 1100÷900 Ms 200 650x1h olio / oil 1180÷1570 7 27,5 830÷1130 10 30 690÷980 11 30 ≤ 230 149÷194 ≤ 179 11 30 63 930 590 490 90% 70% 44 35 25 - mm. HRc min HRc max 1,5 3 5 7 9 11 13 15 20 25 30 35 40 45 50 41 34 28 25 22 19 49 47,5 44,5 41 36 32,5 30,5 29 26 24,5 23 22,5 22 22 22 10 5 20 13 5 35 20 11 49 29 17 61 38 24 69 45 30 77 52 36 84 58 41 101 74 54 90 70 106 82 - HRC mm 20NiCrMo2 Normativa di riferimento UNI 7846 Reference standard UNI 7846 39 Temprato e disteso Hardened and stress relieved

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TemprabilitàHardenability HRC / % Martensite Diametro temprabile mm./Hardenable diameter mm.

olio/oil acqua/water

Superficie / Surface3/4 Raggio dal centro / 3/4 radius from center

Centro / Centre

Olio poco agitatoSlightly stired oil

Temprabilità JominyJominy hardenability

Distanza dall’estremitàtemprata

Distance from quenchedend

Durezza RockwellRockwell hardness

Re min.N/mm2

RmN/mm2

A min.%

KCU min.J

Ricotto lavorabile / Soft-annealedRicotto isotermico/Isothermal annealedRicotto sferoidale/Spheroidal annealed

Saggio/SpecimenØ mm.

Durezze HB allo statoHB hardness in the following conditions

Caratteristiche meccaniche / Mechanicals properties

StatoConditions

CorrispondenzeComparable standards

ComposizioneChemical analysis

Temperature per lalavorazione a caldoed il trattamentotermicoHot work and heattreatment temperatures

Punti criticiCritical point

FucinaturaForging

NormalizzazioneNormalization

Ricottura subcriticaSubcritical annealing

Ricottura isotermicaIsothermal annealing

Tempra/Hardening1° 2°

Rinvenimento di distensioneStress relieving

151,5 3 5 7 9 11 13 15 20 25 30 35 40 45 50

SIAU DIN W.N. AFNOR BS AISI/SAEHD20 (21NiCrMo2) (1.6523) 20NCD2 (8620)

C Mn Si Cr Ni Mo.17÷.23 .60÷.90 .15÷.40 .35÷.65 .15÷.25

P e S≤ .035.40÷.70

Ac1 735

650÷700

850÷870

160÷200Ac3 820

850÷880840÷890

810÷830Ms 380 1100÷900

Ms 200650x1h

olio / oil

1180÷1570 7 27,5830÷1130 10 30690÷980 11 30

≤ 230149÷194

≤ 179

113063

930590490

90% 70%44 35 25 -

mm. HRc min HRc max1,5357911131520253035404550

413428252219

4947,544,5413632,530,5292624,52322,5222222

105

20135

352011

492917

613824

694530

775236

845841

1017454

9070

10682

HRC

20NiCrMo2Normat i va d i r i f e r imen to UNI 7846R e f e r e n c e s t a n d a r d U N I 7 8 4 6

Temprato edisteso

Hardenedand stressrelieved

Trattamento: su Ø 11 mmTreatment: on Ø 11 mm

Tempra: 870 °C olioHardening: 870 °C oil

Rinvenimento per 2 oreTempering for 2 hours

Temperatura di rinvenimento °CTempering temperature °C

Diagramma T.T.T.T.T.T. diagram

Diagramma di rinvenimentoTempering curve

20NiCrMo2

Austenitizzazione: 840 °CAustenitizing: 840 °C

Quadro: 10 mmSquare: 10 mm

TEMPO/TIME

secondiseconds

Case-hardened layer

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