{"id":1401,"date":"2026-04-02T16:09:05","date_gmt":"2026-04-02T08:09:05","guid":{"rendered":"https:\/\/www.jycomat.com\/?post_type=product&p=1401"},"modified":"2026-04-02T16:10:06","modified_gmt":"2026-04-02T08:10:06","slug":"aisi-4340-steel-36crnimo4-1-6511-en24-817m40-sncm439","status":"publish","type":"product","link":"https:\/\/www.jycomat.com\/it\/prodotto\/aisi-4340-steel-36crnimo4-1-6511-en24-817m40-sncm439\/","title":{"rendered":"Acciaio AISI 4340 \/ 36CrNiMo4 \/ 1.6511 \/ EN24 \/ 817M40 \/ SNCM439"},"content":{"rendered":"
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Specifiche dell'acciaio AISI 4340 e norme pertinenti<\/h3>
Paese<\/td>STATI UNITI D'AMERICA<\/td>Gran Bretagna<\/td>Gran Bretagna<\/td>Giappone<\/td><\/tr>
Standard<\/td>ASTM A29<\/td>EN 10250<\/td>BS 970<\/td>JIS G4103<\/td><\/tr>
Gradi<\/td>4340<\/td>36CrNiMo4\/
1.6511<\/td>		EN24\/817M40<\/td>SNCM 439\/SNCM8<\/td><\/tr><\/tbody><\/table><\/div>

Composizione chimica degli acciai ASTM 4340 ed equivalenti<\/h3>
Standard<\/td>Grado<\/td>C<\/td>Mn<\/td>P<\/td>S<\/td>Si<\/td>Ni<\/td>Cr<\/td>Mo<\/td><\/tr>
ASTM A29<\/td>4340<\/td>0.38-0.43<\/td>0.60-0.80<\/td>0.035<\/td>0.040<\/td>0.15-0.35<\/td>1.65-2.00<\/td>0.70-0.90<\/td>0.20-0.30<\/td><\/tr>
EN 10250<\/td>36CrNiMo4\/
1.6511<\/td>		0.32-0.40<\/td>0.50-0.80<\/td>0.035<\/td>0.035<\/td>\u22660.40<\/td>0.90-1.20<\/td>0.90-1.2<\/td>0.15-0.30<\/td><\/tr>
BS 970<\/td>EN24\/817M40<\/td>0.36-0.44<\/td>0.45-0.70<\/td>0.035<\/td>0.040<\/td>0.1-0.40<\/td>1.3-1.7<\/td>1.00-1.40<\/td>0.20-0.35<\/td><\/tr>
JIS G4103<\/td>SNCM 439\/SNCM8<\/td>0.36-0.43<\/td>0.60-0.90<\/td>0.030<\/td>0.030<\/td>0.15-0.35<\/td>1.60-2.00<\/td>0.60-1.00<\/td>0.15-0.30

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Propriet\u00e0 meccaniche dell'acciaio AISI 4340<\/h3>
Propriet\u00e0 meccaniche

(Condizione di trattamento termico)<\/p><\/td>

Condizione<\/td>Sezione di giudizio
mm<\/td>		Resistenza alla trazione MPa<\/td>Resistenza allo snervamento
MPa<\/td>		Elong.
%<\/td>		Impatto Izod
J<\/td>		Brinell
Durezza<\/td><\/tr>
T<\/td>250<\/td>850-1000<\/td>635<\/td>13<\/td>40<\/td>248-302<\/td><\/tr>
T<\/td>150<\/td>850-1000<\/td>665<\/td>13<\/td>54<\/td>248-302<\/td><\/tr>
U<\/td>100<\/td>930-1080<\/td>740<\/td>12<\/td>47<\/td>269-331<\/td><\/tr>
\u00a0<\/td><\/tr>
V<\/td>63<\/td>1000-1150<\/td>835<\/td>12<\/td>47<\/td>293-352<\/td><\/tr>
W<\/td>30<\/td>1080-1230<\/td>925<\/td>11<\/td>41<\/td>311-375<\/td><\/tr>
X<\/td>30<\/td>1150-1300<\/td>1005<\/td>10<\/td>34<\/td>341-401<\/td><\/tr>
\u00a0<\/td><\/tr>
Y<\/td>30<\/td>1230-1380<\/td>1080<\/td>10<\/td>24<\/td>363-429<\/td><\/tr>
Z<\/td>30<\/td>1555-<\/td>1125<\/td>5<\/td>10<\/td>444-<\/td><\/tr><\/tbody><\/table><\/div>

Propriet\u00e0 termiche<\/h3>
Propriet\u00e0<\/td>Metrico<\/td>Imperiale<\/td><\/tr>
Coefficiente di espansione termica (20\u00b0C\/68\u00b0F, provino indurito in olio, tempra 600\u00b0C (1110\u00b0F))<\/td>12,3 \u00b5m\/m\u00b0C<\/td>6,83 \u00b5in\/in\u00b0F<\/td><\/tr>
Conduttivit\u00e0 termica (acciaio tipico)<\/td>44,5 W\/mK<\/td>309 BTU in\/hr.ft\u00b2.\u00b0F<\/td><\/tr><\/tbody><\/table><\/div>

Forgiatura di acciaio legato 4340<\/h3>

Preriscaldare prima l'acciaio 4340, riscaldare fino a 1150\u00b0C - 1200\u00b0C al massimo per la forgiatura, tenere fino a quando la temperatura \u00e8 uniforme in tutta la sezione.<\/p>

Non forgiare a temperature inferiori a 850 \u00b0C. Il 4340 ha buone caratteristiche di forgiatura, ma occorre prestare attenzione durante il raffreddamento, poich\u00e9 l'acciaio \u00e8 soggetto a cricche. Dopo la forgiatura, il pezzo deve essere raffreddato il pi\u00f9 lentamente possibile. Si raccomanda di raffreddare in sabbia o calce secca, ecc.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

L'acciaio AISI 4340 \u00e8 un acciaio a medio tenore di carbonio e basso tenore di lega, noto per la sua tenacit\u00e0 e resistenza in sezioni relativamente grandi. L'AISI 4340 \u00e8 anche un tipo di acciaio al nichel-cromo-molibdeno. L'acciaio legato 4340 viene generalmente fornito temprato e rinvenuto in un intervallo di trazione compreso tra 930 e 1080 Mpa.<\/p>","protected":false},"featured_media":1402,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"no-sidebar","site-content-layout":"","ast-site-content-layout":"full-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}}},"product_brand":[],"product_cat":[22],"product_tag":[64],"class_list":["post-1401","product","type-product","status-publish","has-post-thumbnail","product_cat-mold-steel","product_tag-mold-steel","desktop-align-left","tablet-align-left","mobile-align-left","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/www.jycomat.com\/it\/wp-json\/wp\/v2\/product\/1401","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jycomat.com\/it\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.jycomat.com\/it\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jycomat.com\/it\/wp-json\/wp\/v2\/comments?post=1401"}],"version-history":[{"count":0,"href":"https:\/\/www.jycomat.com\/it\/wp-json\/wp\/v2\/product\/1401\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.jycomat.com\/it\/wp-json\/wp\/v2\/media\/1402"}],"wp:attachment":[{"href":"https:\/\/www.jycomat.com\/it\/wp-json\/wp\/v2\/media?parent=1401"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.jycomat.com\/it\/wp-json\/wp\/v2\/product_brand?post=1401"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.jycomat.com\/it\/wp-json\/wp\/v2\/product_cat?post=1401"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.jycomat.com\/it\/wp-json\/wp\/v2\/product_tag?post=1401"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}