{"id":5705,"date":"2025-12-24T01:41:35","date_gmt":"2025-12-24T01:41:35","guid":{"rendered":"https:\/\/korea-transmission.com\/?p=5705"},"modified":"2025-12-24T01:41:35","modified_gmt":"2025-12-24T01:41:35","slug":"gb-t-3098-8-bolts-for-200c-to-700c-use","status":"publish","type":"post","link":"https:\/\/korea-transmission.com\/pt\/blog\/gb-t-3098-8-bolts-for-200c-to-700c-use\/","title":{"rendered":"Parafusos GB\/T 3098.8 para uso em temperaturas de -200 \u00b0C a +700 \u00b0C."},"content":{"rendered":"<div class=\"section\" style=\"background-color: #f9f9f9; padding: 20px; border-radius: 5px;\">\n<h2>Introdu\u00e7\u00e3o \u00e0 norma GB\/T 3098.8<\/h2>\n<p>Esta norma descreve as propriedades mec\u00e2nicas, os materiais, a inspe\u00e7\u00e3o, a identifica\u00e7\u00e3o e a marca\u00e7\u00e3o de pe\u00e7as de conex\u00e3o aparafusadas que operam em temperaturas extremas, de -200 \u00b0C a +700 \u00b0C. Ela garante a confiabilidade em aplica\u00e7\u00f5es como vasos de press\u00e3o, caldeiras e m\u00e1quinas de alta temperatura, complementando normas como GB\/T 3098.1, GB\/T 3098.6 e DIN EN 10269.<\/p>\n<\/div>\n<div class=\"section\">\n<h2>Escopo<\/h2>\n<p>A norma GB\/T 3098.8-2010 especifica os requisitos para fixadores fabricados em a\u00e7os austen\u00edticos para baixas temperaturas at\u00e9 -200 \u00b0C e em a\u00e7os\/ligas de n\u00edquel para altas temperaturas at\u00e9 +700 \u00b0C. Ela abrange classes de desempenho mec\u00e2nico, m\u00e9todos de ensaio e compatibilidade de materiais para garantir a integridade estrutural sob tens\u00f5es t\u00e9rmicas. Isso \u00e9 crucial para ind\u00fastrias que exigem resist\u00eancia \u00e0 flu\u00eancia, relaxa\u00e7\u00e3o e falha fr\u00e1gil.<\/p>\n<ul>\n<li>Aplica-se a parafusos, pinos e porcas em conex\u00f5es aparafusadas.<\/li>\n<li>Prioriza a capacidade total de carga para opera\u00e7\u00e3o segura em ambientes extremos.<\/li>\n<li>Refer\u00eancias \u00e0s normas relacionadas para conformidade abrangente.<\/li>\n<\/ul>\n<\/div>\n<div class=\"section\">\n<h2>Materiais e propriedades mec\u00e2nicas<\/h2>\n<p>Os materiais s\u00e3o selecionados com base em faixas de temperatura para manter a integridade mec\u00e2nica. Para baixas temperaturas, os a\u00e7os austen\u00edticos oferecem ductilidade; para altas temperaturas, os a\u00e7os e as ligas de n\u00edquel oferecem resist\u00eancia e resist\u00eancia \u00e0 flu\u00eancia. As propriedades devem atender aos requisitos especificados de dureza, resist\u00eancia \u00e0 tra\u00e7\u00e3o e cargas de prova.<\/p>\n<h3 style=\"font-size: 18px; color: #555;\">Materiais para baixas temperaturas<\/h3>\n<p>A Tabela 1 lista os grupos de a\u00e7os austen\u00edticos para temperaturas m\u00ednimas de trabalho at\u00e9 -200 \u00b0C, com propriedades de acordo com as normas GB\/T 3098.6 e GB\/T 3098.15. Teor de cobre \u22641%. Temperaturas mais elevadas n\u00e3o t\u00eam impacto; temperaturas mais baixas exigem testes de desempenho espec\u00edficos para cada condi\u00e7\u00e3o.<\/p>\n<div class=\"table-container\" style=\"overflow-x: auto; width: 100%;\">\n<table style=\"width: 100%;\">\n<thead>\n<tr>\n<th style=\"width: 55.2192%;\" rowspan=\"2\">Temperatura m\u00ednima de trabalho cont\u00ednuo (aproximada)<\/th>\n<th style=\"width: 20.3549%;\" rowspan=\"2\">Grupo de A\u00e7o<sup>um<\/sup><\/th>\n<th style=\"width: 23.3821%;\" colspan=\"2\">Grau de desempenho<\/th>\n<\/tr>\n<tr>\n<th style=\"width: 13.4656%;\">Parafuso<\/th>\n<th style=\"width: 9.91649%;\">Noz<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"width: 55.2192%;\" rowspan=\"3\">-60\u00b0C<sup>b<\/sup><\/td>\n<td style=\"width: 20.3549%;\">A2L<\/td>\n<td style=\"width: 13.4656%;\" rowspan=\"3\">50<\/td>\n<td style=\"width: 9.91649%;\" rowspan=\"2\">50<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 20.3549%;\">A2<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 20.3549%;\">A3<\/td>\n<td style=\"width: 9.91649%;\" rowspan=\"2\">70<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 55.2192%;\" rowspan=\"3\">-200\u00b0C<sup>c<\/sup><\/td>\n<td style=\"width: 20.3549%;\">A4L<\/td>\n<td style=\"width: 13.4656%;\" rowspan=\"3\">70<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 20.3549%;\">A4<\/td>\n<td style=\"width: 9.91649%;\" rowspan=\"2\">80<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 20.3549%;\">A5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p><sup>um<\/sup> Teor de cobre \u22641% (de acordo com GB\/T 3098.6 e GB\/T 3098.15).<br \/>\n<sup>b<\/sup> Parafusos com cabe\u00e7a.<br \/>\n<sup>c<\/sup> Tachas.<\/p>\n<h3 style=\"font-size: 18px; color: #555;\">Materiais para Altas Temperaturas<\/h3>\n<p>A Tabela 2 especifica a\u00e7os e ligas de n\u00edquel para temperaturas de at\u00e9 +700 \u00b0C, com propriedades de acordo com a Tabela 4 da norma DIN EN 10269 para tratamento t\u00e9rmico. Dados de refer\u00eancia para limite de escoamento, resist\u00eancia \u00e0 flu\u00eancia e relaxa\u00e7\u00e3o provenientes das Tabelas 5, C.1 e D.1 da norma DIN EN 10269. Relativo \u00e0s chapas AD 2000-W2, W7, W10 e VdTUV.<\/p>\n<div class=\"table-container\" style=\"overflow-x: auto; width: 100%;\">\n<table style=\"width: 100%;\">\n<thead>\n<tr>\n<th colspan=\"3\">Faixa de temperatura de trabalho de acordo com DIN EN 10269<\/th>\n<th colspan=\"4\">Material<\/th>\n<th colspan=\"2\">Dureza\/HV do parafuso e\/ou porca<\/th>\n<\/tr>\n<tr>\n<th>min<\/th>\n<th>Curto prazo<sup>um<\/sup> m\u00e1ximo<\/th>\n<th>Longo prazo<sup>b<\/sup> m\u00e1ximo<\/th>\n<th>Abrevia\u00e7\u00e3o<\/th>\n<th>N\u00famero<\/th>\n<th>Nota<\/th>\n<th>Doen\u00e7a<\/th>\n<th>min<\/th>\n<th>m\u00e1ximo<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td rowspan=\"2\">-120\u00b0C<\/td>\n<td rowspan=\"2\">\/<\/td>\n<td rowspan=\"2\">\/<\/td>\n<td rowspan=\"2\">KB<\/td>\n<td rowspan=\"2\">1.568<\/td>\n<td rowspan=\"2\">X12Ni5<\/td>\n<td>+NT<\/td>\n<td>157<\/td>\n<td>203<\/td>\n<\/tr>\n<tr>\n<td>+QT<\/td>\n<td>173<\/td>\n<td>235<\/td>\n<\/tr>\n<tr>\n<td>\/<\/td>\n<td>400\u00b0C<\/td>\n<td>500\u00b0C<\/td>\n<td>Yd<\/td>\n<td>1.1181<\/td>\n<td>C35E<\/td>\n<td>+N<\/td>\n<td>150<\/td>\n<td>200<\/td>\n<\/tr>\n<tr>\n<td>\/<\/td>\n<td>400\u00b0C<\/td>\n<td>500\u00b0C<\/td>\n<td>YK<\/td>\n<td>1.1181<\/td>\n<td>C35E<\/td>\n<td>+QT<\/td>\n<td>165<\/td>\n<td>210<\/td>\n<\/tr>\n<tr>\n<td>\/<\/td>\n<td>400\u00b0C<\/td>\n<td>\/<\/td>\n<td>YB<\/td>\n<td>1.5511<\/td>\n<td>35B2<sup>g<\/sup><\/td>\n<td>+QT<\/td>\n<td>165<\/td>\n<td>210<\/td>\n<\/tr>\n<tr>\n<td>-60\u00b0C<\/td>\n<td>500\u00b0C<\/td>\n<td>550\u00b0C<\/td>\n<td>KG<\/td>\n<td>1.7218<\/td>\n<td>25CrMo4<\/td>\n<td>+QT<\/td>\n<td>195<\/td>\n<td>240<\/td>\n<\/tr>\n<tr>\n<td>-100\u00b0C<\/td>\n<td>500\u00b0C<\/td>\n<td>\/<\/td>\n<td>GC<\/td>\n<td>1.7225<\/td>\n<td>42CrMo4<\/td>\n<td>+QT<\/td>\n<td>275<\/td>\n<td>337<\/td>\n<\/tr>\n<tr>\n<td>\/<\/td>\n<td>500\u00b0C<\/td>\n<td>550\u00b0C<\/td>\n<td>GA<\/td>\n<td>1.7709<\/td>\n<td>21CrMoV5-7<\/td>\n<td>+QT<\/td>\n<td>225<\/td>\n<td>272<\/td>\n<\/tr>\n<tr>\n<td>\/<\/td>\n<td>600\u00b0C<\/td>\n<td>550\u00b0C<\/td>\n<td>GB<\/td>\n<td>1.7711<\/td>\n<td>40CrMoV46<\/td>\n<td>+QT<\/td>\n<td>272<\/td>\n<td>320<\/td>\n<\/tr>\n<tr>\n<td>\/<\/td>\n<td>550\u00b0C<\/td>\n<td>600\u00b0C<\/td>\n<td>Ve<\/td>\n<td>1.4923<\/td>\n<td>X22CrMoV12-1<\/td>\n<td>+QT 1<sup>e<\/sup><\/td>\n<td>256<\/td>\n<td>303<\/td>\n<\/tr>\n<tr>\n<td>\/<\/td>\n<td>550\u00b0C<\/td>\n<td>600\u00b0C<\/td>\n<td>VH<sup>f<\/sup><\/td>\n<td>1.4923<\/td>\n<td>X22CrMoV12-1<\/td>\n<td>+QT 2<sup>f<\/sup><\/td>\n<td>287<\/td>\n<td>367<\/td>\n<\/tr>\n<tr>\n<td>\/<\/td>\n<td>600\u00b0C<\/td>\n<td>600\u00b0C<\/td>\n<td>VW<\/td>\n<td>1.4913<\/td>\n<td>X19CrMoNbVN11-1<\/td>\n<td>+QT<\/td>\n<td>287<\/td>\n<td>367<\/td>\n<\/tr>\n<tr>\n<td>\/<\/td>\n<td>650\u00b0C<\/td>\n<td>670\u00b0C<\/td>\n<td>S<\/td>\n<td>1.4986<\/td>\n<td>X7CrNiMoBNb16-16<\/td>\n<td>+WW+P<\/td>\n<td>210<\/td>\n<td>272<\/td>\n<\/tr>\n<tr>\n<td>-196\u00b0C<\/td>\n<td>650\u00b0C<\/td>\n<td>650\u00b0C<\/td>\n<td>SD<\/td>\n<td>1.498<\/td>\n<td>X6NiCrTiMoVB25-15-2<\/td>\n<td>+AT+P<\/td>\n<td>287<\/td>\n<td>367<\/td>\n<\/tr>\n<tr>\n<td>-196\u00b0C<\/td>\n<td>650\u00b0C<\/td>\n<td>800\u00b0C<\/td>\n<td>SB<\/td>\n<td>2.4952<\/td>\n<td>NiCr20TiAl<\/td>\n<td>+AT+P<\/td>\n<td>320<\/td>\n<td>417<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p><sup>um<\/sup> Limite de temperatura para resist\u00eancia ao escoamento e \u00e0 tra\u00e7\u00e3o.<br \/>\n<sup>b<\/sup> Limite de temperatura para resist\u00eancia \u00e0 flu\u00eancia e \u00e0 ruptura.<br \/>\n<sup>c<\/sup> Condi\u00e7\u00f5es de acordo com a norma DIN EN 10269 Tabela 4: +N (normalizado), +NT (normalizado e revenido), +QT (temperado e revenido), +WW (trabalhado a quente), +AT (solubilizado), +P (endurecido por precipita\u00e7\u00e3o).<br \/>\n<sup>d<\/sup> Somente para nozes.<br \/>\n<sup>e<\/sup> V conforme DIN EN 10269, Rp0,2 \u2265600 N\/mm\u00b2 (+QT1).<br \/>\n<sup>f<\/sup> VH conforme DIN EN 10269, Rp0,2 \u2265600 N\/mm\u00b2 (+QT2).<br \/>\n<sup>g<\/sup> Ver VdTUV WB 490.<\/p>\n<\/div>\n<div class=\"section\">\n<h2>Capacidades de carga<\/h2>\n<p>Os valores de carga garantem que os fixadores suportem as tens\u00f5es operacionais. Utilize para verifica\u00e7\u00e3o do projeto.<\/p>\n<h3 style=\"font-size: 18px; color: #555;\">Cargas m\u00ednimas de tra\u00e7\u00e3o para parafusos de rosca grossa<\/h3>\n<p>Tabela 4a: A<sub>s,nom<\/sub> \u00d7 R<sub>m,min<\/sub> \/kN<\/p>\n<div class=\"table-container\" style=\"overflow-x: auto; width: 100%;\">\n<table style=\"width: 100%;\">\n<thead>\n<tr>\n<th rowspan=\"3\">Tamanho da rosca d<\/th>\n<th rowspan=\"3\">\u00c1rea de estresse A<sub>s,nom<\/sub> \/mm\u00b2<\/th>\n<th colspan=\"2\">A\u00e7o inoxid\u00e1vel austen\u00edtico<\/th>\n<th colspan=\"11\">A\u00e7o e ligas de n\u00edquel<\/th>\n<\/tr>\n<tr>\n<th rowspan=\"2\">50<\/th>\n<th rowspan=\"2\">70<\/th>\n<th rowspan=\"2\">KB<\/th>\n<th>YK<\/th>\n<th rowspan=\"2\">KG<\/th>\n<th rowspan=\"2\">GA<\/th>\n<th rowspan=\"2\">GB<\/th>\n<th rowspan=\"2\">GC<\/th>\n<th rowspan=\"2\">V<\/th>\n<th>VH<\/th>\n<th rowspan=\"2\">S<\/th>\n<th rowspan=\"2\">SD<\/th>\n<th rowspan=\"2\">SB<\/th>\n<\/tr>\n<tr>\n<th>YB<\/th>\n<th>VW<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>M3<\/td>\n<td>5.03<\/td>\n<td>2.52<\/td>\n<td>3.52<\/td>\n<td>2.67<\/td>\n<td>2.52<\/td>\n<td>3.02<\/td>\n<td>3.52<\/td>\n<td>4.28<\/td>\n<td>4.33<\/td>\n<td>4.02<\/td>\n<td>4.53<\/td>\n<td>3.27<\/td>\n<td>4.53<\/td>\n<td>5.03<\/td>\n<\/tr>\n<tr>\n<td>M3.5<\/td>\n<td>6.78<\/td>\n<td>3.39<\/td>\n<td>4.75<\/td>\n<td>3.59<\/td>\n<td>3.39<\/td>\n<td>4.07<\/td>\n<td>4.75<\/td>\n<td>5.76<\/td>\n<td>5.83<\/td>\n<td>5.42<\/td>\n<td>6.1<\/td>\n<td>4.41<\/td>\n<td>6.1<\/td>\n<td>6.78<\/td>\n<\/tr>\n<tr>\n<td>M4<\/td>\n<td>8.78<\/td>\n<td>4.39<\/td>\n<td>6.15<\/td>\n<td>4.65<\/td>\n<td>4.39<\/td>\n<td>5.27<\/td>\n<td>6.15<\/td>\n<td>7.46<\/td>\n<td>7.55<\/td>\n<td>7.02<\/td>\n<td>7.9<\/td>\n<td>5.71<\/td>\n<td>7.9<\/td>\n<td>8.78<\/td>\n<\/tr>\n<tr>\n<td>M5<\/td>\n<td>14.2<\/td>\n<td>7.1<\/td>\n<td>9.94<\/td>\n<td>7.53<\/td>\n<td>7.1<\/td>\n<td>8.52<\/td>\n<td>9.94<\/td>\n<td>12.1<\/td>\n<td>12.2<\/td>\n<td>11.4<\/td>\n<td>12.8<\/td>\n<td>9.23<\/td>\n<td>12.8<\/td>\n<td>14.2<\/td>\n<\/tr>\n<tr>\n<td>M6<\/td>\n<td>20.1<\/td>\n<td>10.1<\/td>\n<td>14.1<\/td>\n<td>10.7<\/td>\n<td>10.1<\/td>\n<td>12.1<\/td>\n<td>14.1<\/td>\n<td>17.1<\/td>\n<td>17.3<\/td>\n<td>16.1<\/td>\n<td>18.1<\/td>\n<td>13.1<\/td>\n<td>18.1<\/td>\n<td>20.1<\/td>\n<\/tr>\n<tr>\n<td>M7<\/td>\n<td>28.9<\/td>\n<td>14.5<\/td>\n<td>20.2<\/td>\n<td>15.3<\/td>\n<td>14.5<\/td>\n<td>17.3<\/td>\n<td>20.2<\/td>\n<td>24.6<\/td>\n<td>24.9<\/td>\n<td>23.1<\/td>\n<td>26<\/td>\n<td>18.8<\/td>\n<td>26<\/td>\n<td>28.9<\/td>\n<\/tr>\n<tr>\n<td>M8<\/td>\n<td>36.6<\/td>\n<td>18.3<\/td>\n<td>25.6<\/td>\n<td>19.4<\/td>\n<td>18.3<\/td>\n<td>22<\/td>\n<td>25.6<\/td>\n<td>31.1<\/td>\n<td>31.5<\/td>\n<td>29.3<\/td>\n<td>32.9<\/td>\n<td>23.8<\/td>\n<td>32.9<\/td>\n<td>36.6<\/td>\n<\/tr>\n<tr>\n<td>M10<\/td>\n<td>58<\/td>\n<td>29<\/td>\n<td>40.6<\/td>\n<td>30.7<\/td>\n<td>29<\/td>\n<td>34.8<\/td>\n<td>40.6<\/td>\n<td>49.3<\/td>\n<td>49.9<\/td>\n<td>46.4<\/td>\n<td>52.2<\/td>\n<td>37.7<\/td>\n<td>52.2<\/td>\n<td>58<\/td>\n<\/tr>\n<tr>\n<td>M12<\/td>\n<td>84.3<\/td>\n<td>42.2<\/td>\n<td>59<\/td>\n<td>44.7<\/td>\n<td>42.2<\/td>\n<td>50.6<\/td>\n<td>59<\/td>\n<td>71.7<\/td>\n<td>72.5<\/td>\n<td>67.4<\/td>\n<td>75.9<\/td>\n<td>54.8<\/td>\n<td>75.9<\/td>\n<td>84.3<\/td>\n<\/tr>\n<tr>\n<td>M14<\/td>\n<td>115<\/td>\n<td>57.5<\/td>\n<td>80.5<\/td>\n<td>61<\/td>\n<td>57.5<\/td>\n<td>69<\/td>\n<td>80.5<\/td>\n<td>97.8<\/td>\n<td>98.9<\/td>\n<td>92<\/td>\n<td>104<\/td>\n<td>74.8<\/td>\n<td>104<\/td>\n<td>115<\/td>\n<\/tr>\n<tr>\n<td>M16<\/td>\n<td>157<\/td>\n<td>78.5<\/td>\n<td>110<\/td>\n<td>83.2<\/td>\n<td>78.5<\/td>\n<td>94.2<\/td>\n<td>110<\/td>\n<td>133<\/td>\n<td>135<\/td>\n<td>126<\/td>\n<td>141<\/td>\n<td>102<\/td>\n<td>141<\/td>\n<td>157<\/td>\n<\/tr>\n<tr>\n<td>M18<\/td>\n<td>192<\/td>\n<td>96<\/td>\n<td>134<\/td>\n<td>102<\/td>\n<td>96<\/td>\n<td>115<\/td>\n<td>134<\/td>\n<td>163<\/td>\n<td>165<\/td>\n<td>154<\/td>\n<td>173<\/td>\n<td>125<\/td>\n<td>173<\/td>\n<td>192<\/td>\n<\/tr>\n<tr>\n<td>M20<\/td>\n<td>245<\/td>\n<td>123<\/td>\n<td>172<\/td>\n<td>130<\/td>\n<td>123<\/td>\n<td>147<\/td>\n<td>172<\/td>\n<td>208<\/td>\n<td>211<\/td>\n<td>196<\/td>\n<td>221<\/td>\n<td>159<\/td>\n<td>221<\/td>\n<td>245<\/td>\n<\/tr>\n<tr>\n<td>M22<\/td>\n<td>303<\/td>\n<td>152<\/td>\n<td>212<\/td>\n<td>161<\/td>\n<td>152<\/td>\n<td>182<\/td>\n<td>212<\/td>\n<td>258<\/td>\n<td>261<\/td>\n<td>242<\/td>\n<td>273<\/td>\n<td>197<\/td>\n<td>273<\/td>\n<td>303<\/td>\n<\/tr>\n<tr>\n<td>M24<\/td>\n<td>353<\/td>\n<td>177<\/td>\n<td>247<\/td>\n<td>187<\/td>\n<td>177<\/td>\n<td>212<\/td>\n<td>247<\/td>\n<td>300<\/td>\n<td>304<\/td>\n<td>282<\/td>\n<td>318<\/td>\n<td>229<\/td>\n<td>318<\/td>\n<td>353<\/td>\n<\/tr>\n<tr>\n<td>M27<\/td>\n<td>459<\/td>\n<td>230<\/td>\n<td>\/<\/td>\n<td>243<\/td>\n<td>230<\/td>\n<td>275<\/td>\n<td>321<\/td>\n<td>390<\/td>\n<td>395<\/td>\n<td>367<\/td>\n<td>413<\/td>\n<td>298<\/td>\n<td>413<\/td>\n<td>459<\/td>\n<\/tr>\n<tr>\n<td>M30<\/td>\n<td>561<\/td>\n<td>281<\/td>\n<td>\/<\/td>\n<td>297<\/td>\n<td>281<\/td>\n<td>337<\/td>\n<td>393<\/td>\n<td>477<\/td>\n<td>482<\/td>\n<td>449<\/td>\n<td>505<\/td>\n<td>365<\/td>\n<td>505<\/td>\n<td>561<\/td>\n<\/tr>\n<tr>\n<td>M33<\/td>\n<td>694<\/td>\n<td>347<\/td>\n<td>\/<\/td>\n<td>368<\/td>\n<td>347<\/td>\n<td>416<\/td>\n<td>486<\/td>\n<td>590<\/td>\n<td>597<\/td>\n<td>555<\/td>\n<td>625<\/td>\n<td>451<\/td>\n<td>625<\/td>\n<td>694<\/td>\n<\/tr>\n<tr>\n<td>M36<\/td>\n<td>817<\/td>\n<td>409<\/td>\n<td>\/<\/td>\n<td>433<\/td>\n<td>409<\/td>\n<td>490<\/td>\n<td>572<\/td>\n<td>694<\/td>\n<td>703<\/td>\n<td>654<\/td>\n<td>735<\/td>\n<td>531<\/td>\n<td>735<\/td>\n<td>817<\/td>\n<\/tr>\n<tr>\n<td>M39<\/td>\n<td>976<\/td>\n<td>488<\/td>\n<td>\/<\/td>\n<td>517<\/td>\n<td>488<\/td>\n<td>586<\/td>\n<td>683<\/td>\n<td>830<\/td>\n<td>839<\/td>\n<td>781<\/td>\n<td>878<\/td>\n<td>634<\/td>\n<td>878<\/td>\n<td>976<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<div class=\"section\">\n<h2>Capacidade de carga das conex\u00f5es de parafusos<\/h2>\n<p>Para capacidade total: Utilizar parafusos e porcas de capacidade total compat\u00edveis com as alturas apropriadas (Tipo 1 para rosca grossa, Tipo 2 para rosca fina), toler\u00e2ncias de rosca e rela\u00e7\u00f5es de resist\u00eancia. A fratura em ensaios de tra\u00e7\u00e3o deve ocorrer em se\u00e7\u00f5es sem rosca, conforme GB\/T 3098.1 ou 3098.6. Prisioneiros com cintura definida, conforme GB\/T 13807.2\/3, com toler\u00e2ncias conforme GB\/T 3103.4.<\/p>\n<ol>\n<li>Realizar ensaios de tra\u00e7\u00e3o para verificar as cargas m\u00ednimas.<\/li>\n<li>Certifique-se de que a altura da porca atenda aos requisitos do tipo para distribui\u00e7\u00e3o de carga.<\/li>\n<li>Selecione os materiais de forma a evitar pontos fracos na montagem.<\/li>\n<\/ol>\n<\/div>\n<div class=\"section\" style=\"background-color: #f9f9f9; padding: 20px; border-radius: 5px;\">\n<h2>Perguntas frequentes<\/h2>\n<h3 style=\"font-size: 16px; margin-bottom: 5px;\">Quais materiais s\u00e3o adequados para aplica\u00e7\u00f5es a -200\u00b0C?<\/h3>\n<p>A\u00e7os austen\u00edticos como A4L, A4, A5 com grau 70 ou 80, garantindo ductilidade e tenacidade conforme a Tabela 1.<\/p>\n<h3 style=\"font-size: 16px; margin-bottom: 5px;\">Como selecionar parafusos e porcas adequados para altas temperaturas?<\/h3>\n<p>Utilize a Tabela 3 para combina\u00e7\u00f5es racionais, garantindo que a resist\u00eancia da porca seja superior a 70% do parafuso e que as toler\u00e2ncias da rosca sejam adequadas para a capacidade total.<\/p>\n<h3 style=\"font-size: 16px; margin-bottom: 5px;\">E se a temperatura de opera\u00e7\u00e3o ultrapassar +700\u00b0C?<\/h3>\n<p>Os limites padr\u00e3o s\u00e3o de +700\u00b0C; para temperaturas mais elevadas, realize testes espec\u00edficos de flu\u00eancia e relaxamento de acordo com as diretrizes da norma DIN EN 10269.<\/p>\n<h3 style=\"font-size: 16px; margin-bottom: 5px;\">Por que uma tens\u00e3o de escoamento mais alta para porcas austen\u00edticas?<\/h3>\n<p>Para compensar as varia\u00e7\u00f5es de fabrica\u00e7\u00e3o em pequenos lotes, garantindo a confiabilidade quando combinados com parafusos mais macios (ver nota b da Tabela 3).<\/p>\n<h3 style=\"font-size: 16px; margin-bottom: 5px;\">Como testar a capacidade m\u00e1xima de carga?<\/h3>\n<p>Realizar ensaios de tra\u00e7\u00e3o de acordo com as normas GB\/T 3098.1 ou 3098.6, verificando a localiza\u00e7\u00e3o da fratura e as cargas m\u00ednimas das Tabelas 4a\/5a.<\/p>\n<h3 style=\"font-size: 16px; margin-bottom: 5px;\">H\u00e1 alguma restri\u00e7\u00e3o quanto ao teor de cobre?<\/h3>\n<p>Sim, \u22641% para a\u00e7os austen\u00edticos para evitar fragiliza\u00e7\u00e3o em servi\u00e7o a baixas temperaturas.<\/p>\n<\/div>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Introduction to GB\/T 3098.8 Standard This standard outlines mechanical properties, materials, inspection, identification, and marking for bolted connection parts operating in extreme temperatures from -200\u00b0C to +700\u00b0C. It ensures reliability in applications such as pressure vessels, boilers, and high-temperature machinery, supplementing standards like GB\/T 3098.1, GB\/T 3098.6, and DIN EN 10269. Scope GB\/T 3098.8-2010 specifies [&hellip;]<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[220],"tags":[],"class_list":["post-5705","post","type-post","status-publish","format-standard","hentry","category-technical-documentation-and-references"],"_links":{"self":[{"href":"https:\/\/korea-transmission.com\/pt\/wp-json\/wp\/v2\/posts\/5705","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/korea-transmission.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/korea-transmission.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/pt\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/pt\/wp-json\/wp\/v2\/comments?post=5705"}],"version-history":[{"count":2,"href":"https:\/\/korea-transmission.com\/pt\/wp-json\/wp\/v2\/posts\/5705\/revisions"}],"predecessor-version":[{"id":5707,"href":"https:\/\/korea-transmission.com\/pt\/wp-json\/wp\/v2\/posts\/5705\/revisions\/5707"}],"wp:attachment":[{"href":"https:\/\/korea-transmission.com\/pt\/wp-json\/wp\/v2\/media?parent=5705"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/korea-transmission.com\/pt\/wp-json\/wp\/v2\/categories?post=5705"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/korea-transmission.com\/pt\/wp-json\/wp\/v2\/tags?post=5705"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}