{"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\/da\/vare\/aisi-4340-steel-36crnimo4-1-6511-en24-817m40-sncm439\/","title":{"rendered":"AISI 4340 st\u00e5l \/ 36CrNiMo4 \/ 1.6511 \/ EN24 \/ 817M40 \/ SNCM439"},"content":{"rendered":"
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AISI 4340 st\u00e5lspecifikation og relevante standarder<\/h3>
Land<\/td>USA<\/td>Storbritannien<\/td>Storbritannien<\/td>Japan<\/td><\/tr>
Standard<\/td>ASTM A29<\/td>EN 10250<\/td>BS 970<\/td>JIS G4103<\/td><\/tr>
Karakterer<\/td>4340<\/td>36CrNiMo4\/
1.6511<\/td>		EN24\/817M40<\/td>SNCM 439\/SNCM8<\/td><\/tr><\/tbody><\/table><\/div>

ASTM 4340 St\u00e5l og tilsvarende kemiske sammens\u00e6tninger<\/h3>
Standard<\/td>Karakter<\/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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AISI Alloy 4340 st\u00e5l Mekaniske egenskaber<\/h3>
Mekaniske egenskaber

(Varmebehandlet tilstand)<\/p><\/td>

Tilstand<\/td>Afg\u00f8rende sektion
mm<\/td>		Tr\u00e6kstyrke MPa<\/td>Udbyttestyrke
MPa<\/td>		Elong.
%<\/td>		Izod Impact
J<\/td>		Brinell
H\u00e5rdhed<\/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>

Termiske egenskaber<\/h3>
Ejendomme<\/td>Metrisk<\/td>Imperial<\/td><\/tr>
Termisk udvidelseskoefficient (20 \u00b0C\/68 \u00b0F, pr\u00f8ve olieh\u00e6rdet, 600 \u00b0C (1110 \u00b0F) tempereret)<\/td>12,3 \u00b5m\/m\u00b0C<\/td>6,83 \u00b5in\/in\u00b0F<\/td><\/tr>
Varmeledningsevne (typisk st\u00e5l)<\/td>44,5 W\/mK<\/td>309 BTU in\/hr.ft\u00b2.\u00b0F<\/td><\/tr><\/tbody><\/table><\/div>

Smedning af 4340 legeret st\u00e5l<\/h3>

Forvarm f\u00f8rst st\u00e5let 4340, varm op til 1150\u00b0C - 1200\u00b0C maksimalt til smedning, hold indtil temperaturen er ensartet i hele sektionen.<\/p>

M\u00e5 ikke smedes under 850 \u00b0C. 4340 har gode smedeegenskaber, men der skal udvises forsigtighed ved afk\u00f8ling, da st\u00e5let er tilb\u00f8jeligt til at revne. Efter smedningen skal arbejdsemnet afk\u00f8les s\u00e5 langsomt som muligt. Og afk\u00f8ling i sand eller t\u00f8r kalk anbefales osv.<\/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":"

AISI 4340-st\u00e5l er et medium kulstofholdigt, lavlegeret st\u00e5l, der er kendt for sin sejhed og styrke i relativt store sektioner. AISI 4340 er ogs\u00e5 en slags nikkel-krom-molybd\u00e6n-st\u00e5l. 4340 legeret st\u00e5l leveres generelt h\u00e6rdet og anl\u00f8bet i tr\u00e6kstyrkeomr\u00e5det 930 - 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\/da\/wp-json\/wp\/v2\/product\/1401","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jycomat.com\/da\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.jycomat.com\/da\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jycomat.com\/da\/wp-json\/wp\/v2\/comments?post=1401"}],"version-history":[{"count":0,"href":"https:\/\/www.jycomat.com\/da\/wp-json\/wp\/v2\/product\/1401\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.jycomat.com\/da\/wp-json\/wp\/v2\/media\/1402"}],"wp:attachment":[{"href":"https:\/\/www.jycomat.com\/da\/wp-json\/wp\/v2\/media?parent=1401"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.jycomat.com\/da\/wp-json\/wp\/v2\/product_brand?post=1401"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.jycomat.com\/da\/wp-json\/wp\/v2\/product_cat?post=1401"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.jycomat.com\/da\/wp-json\/wp\/v2\/product_tag?post=1401"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}