{"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\/sl\/izdelek\/aisi-4340-steel-36crnimo4-1-6511-en24-817m40-sncm439\/","title":{"rendered":"AISI 4340 jeklo \/ 36CrNiMo4 \/ 1.6511 \/ EN24 \/ 817M40 \/ SNCM439"},"content":{"rendered":"
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Specifikacija jekla AISI 4340 in ustrezni standardi<\/h3>
Dr\u017eava<\/td>ZDA<\/td>Velika Britanija<\/td>Velika Britanija<\/td>Japonska<\/td><\/tr>
Standard<\/td>ASTM A29<\/td>EN 10250<\/td>BS 970<\/td>JIS G4103<\/td><\/tr>
Razredi<\/td>4340<\/td>36CrNiMo4\/
1.6511<\/td>		EN24\/817M40<\/td>SNCM 439\/SNCM8<\/td><\/tr><\/tbody><\/table><\/div>

Kemijska sestava jekel ASTM 4340 in enakovrednih jekel<\/h3>
Standard<\/td>Razred<\/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

<\/td><\/tr><\/tbody><\/table><\/div>

Mehanske lastnosti jekla AISI Alloy 4340<\/h3>
Mehanske lastnosti

(toplotno obdelano stanje)<\/p><\/td>

Stanje<\/td>Oddelek za odlo\u010danje
mm<\/td>		Natezna trdnost MPa<\/td>Mo\u010d raztezka
MPa<\/td>		Elong.
%<\/td>		Izod Impact
J<\/td>		Brinell
Trdota<\/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>

Toplotne lastnosti<\/h3>
Lastnosti<\/td>Metri\u010dni<\/td>Imperial<\/td><\/tr>
Koeficient toplotnega raztezanja (20 \u00b0C\/68 \u00b0F, vzorec kaljen v olju, temperatura 600 \u00b0C (1110 \u00b0F))<\/td>12,3 \u00b5m\/m\u00b0C<\/td>6,83 \u00b5in\/in\u00b0F<\/td><\/tr>
Toplotna prevodnost (tipi\u010dno jeklo)<\/td>44,5 W\/mK<\/td>309 BTU in\/hr.ft\u00b2.\u00b0F<\/td><\/tr><\/tbody><\/table><\/div>

Kovanje legiranega jekla 4340<\/h3>

Najprej segrejte jeklo 4340, segrejte na 1150 \u00b0C - najve\u010d 1200 \u00b0C za kovanje, dr\u017eite, dokler temperatura ni enakomerna po celotnem delu.<\/p>

Ne kujte pod 850 \u00b0C. 4340 ima dobre lastnosti kovanja, vendar je treba biti previden pri ohlajanju, saj je jeklo dovzetno za nastanek razpok. Po kovanju je treba obdelovanec hladiti \u010dim po\u010dasneje. Priporo\u010da se hlajenje v pesku ali suhem apnu itd.<\/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":"

Jeklo AISI 4340 je srednje ogljikovo, nizko legirano jeklo, znano po svoji \u017eilavosti in trdnosti v razmeroma velikih presekih. AISI 4340 je tudi ena od vrst nikelj krom molibdenovih jekel. Legirano jeklo 4340 se obi\u010dajno dobavlja kaljeno in popu\u0161\u010deno v nateznem razponu od 930 do 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\/sl\/wp-json\/wp\/v2\/product\/1401","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jycomat.com\/sl\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.jycomat.com\/sl\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jycomat.com\/sl\/wp-json\/wp\/v2\/comments?post=1401"}],"version-history":[{"count":0,"href":"https:\/\/www.jycomat.com\/sl\/wp-json\/wp\/v2\/product\/1401\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.jycomat.com\/sl\/wp-json\/wp\/v2\/media\/1402"}],"wp:attachment":[{"href":"https:\/\/www.jycomat.com\/sl\/wp-json\/wp\/v2\/media?parent=1401"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.jycomat.com\/sl\/wp-json\/wp\/v2\/product_brand?post=1401"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.jycomat.com\/sl\/wp-json\/wp\/v2\/product_cat?post=1401"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.jycomat.com\/sl\/wp-json\/wp\/v2\/product_tag?post=1401"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}