{"id":20396,"date":"2026-10-01T01:05:57","date_gmt":"2026-09-30T17:05:57","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=20396"},"modified":"2026-10-16T00:34:57","modified_gmt":"2026-10-15T16:34:57","slug":"temper-color-time-chart","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/pt\/temper-color-time-chart\/","title":{"rendered":"Tabela de Tempo por Cor de Revenimento para A\u00e7o Ferramenta"},"content":{"rendered":"

Tabela de Tempo por Cor de Revenimento para A\u00e7o Ferramenta<\/h1>\n\n\n\n

Minutos a uma temperatura constante antes que uma pe\u00e7a de a\u00e7o polida atinja palha, marrom, roxo, azul escuro e azul claro, a partir de testes publicados em 1910. Um resumo de refer\u00eancia da pr\u00e1tica publicada e n\u00e3o uma especifica\u00e7\u00e3o da Aobo Steel.<\/p>\n\n\n\n

O que os valores medem<\/h2>\n\n\n\n

Esta \u00e9 uma tabela de tempo e n\u00e3o uma tabela de temperatura. Pe\u00e7as semelhantes de a\u00e7o foram mantidas ao ar, uma temperatura fixa para cada ensaio, e os minutos registrados s\u00e3o os necess\u00e1rios para levar a superf\u00edcie \u00e0 cor completa indicada no topo da coluna. Uma cor de revenimento \u00e9 um filme de \u00f3xido sobre a\u00e7o polido, e o filme continua a espessar enquanto a pe\u00e7a permanece quente, de modo que a cor avan\u00e7a mesmo quando a temperatura nunca muda.<\/p>\n\n\n\n

Os ensaios foram feitos com livre acesso de ar. Os resultados s\u00e3o reproduzidos em The Heat Treatment of Tool Steel, escrito por Harry Brearley em 1910 para oficinas de ferramentas e matrizes, na mesma p\u00e1gina que registra a descoberta por tr\u00e1s do h\u00e1bito da cor de revenimento, que a cor vem da oxida\u00e7\u00e3o superficial e n\u00e3o apenas da temperatura.<\/p>\n\n\n\n

Minutos para atingir cada cor de revenimento<\/h2>\n\n\n\n

Minutos a uma temperatura, a\u00e7o polido aquecido ao ar<\/h3>\n\n\n\n
Temperatura<\/th>Palha<\/th>Marrom<\/th>Roxo<\/th>Azul escuro<\/th>Azul claro<\/th><\/tr><\/thead>
200° C<\/td>6<\/td>49<\/td>\u2013<\/td>\u2013<\/td>\u2013<\/td><\/tr>
220° C<\/td>3<\/td>33<\/td>63<\/td>\u2013<\/td>\u2013<\/td><\/tr>
250° C<\/td>1<\/td>10<\/td>39<\/td>\u2013<\/td>\u2013<\/td><\/tr>
275° C<\/td>0.5<\/td>3<\/td>11<\/td>27<\/td>40<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Fonte, a tabela de revenimento em The Heat Treatment of Tool Steel (Harry Brearley).<\/em><\/p>\n\n\n\n

Minutos a uma temperatura antes que a cor completa apare\u00e7a em uma pe\u00e7a polida aquecida ao ar. Um tra\u00e7o significa que a fonte n\u00e3o fornece valor para esse par. O meio minuto a 275 graus C est\u00e1 impresso como fra\u00e7\u00e3o na fonte. As pe\u00e7as testadas eram de tamanho semelhante, portanto os tempos variam com o tamanho da se\u00e7\u00e3o e com a atmosfera do forno.<\/em><\/p>\n\n\n\n

Leia as colunas primeiro<\/h2>\n\n\n\n

Toda cor chega mais cedo \u00e0 medida que a temperatura sobe. Palha leva 6 minutos a 200 graus C e meio minuto a 275. Marrom leva 49 minutos a 200 e 3 minutos a 275. Roxo n\u00e3o aparece a 200 nestes ensaios, precisa de 63 minutos a 220 e chega em 11 minutos a 275. Azul escuro e azul claro s\u00e3o atingidos apenas no ensaio mais quente, aos 27 e 40 minutos.<\/p>\n\n\n\n

O intervalo entre a primeira cor e a \u00faltima \u00e9 o que importa na bancada. A 275 graus C uma pe\u00e7a vai de palha a azul claro em 40 minutos. A 220 graus C leva uma hora para ir de palha a roxo, e as duas cores mais quentes nunca s\u00e3o atingidas. Ler uma cor \u00e9, portanto, uma verifica\u00e7\u00e3o de quanto tempo a pe\u00e7a esteve quente tanto quanto de qu\u00e3o quente est\u00e1, e as duas n\u00e3o podem ser separadas a olho nu.<\/p>\n\n\n\n

A mesma cor n\u00e3o \u00e9 o mesmo revenimento<\/h2>\n\n\n\n

Um determinado tom marca uma temperatura diferente em um ensaio diferente. A mesma p\u00e1gina traz uma demonstra\u00e7\u00e3o de Turner de que um roxo pode ser produzido a 250 graus C em poucos minutos, que o mesmo roxo precisa de cerca de uma hora a 220 graus C e que leva aproximadamente doze horas a 170 graus C. Tr\u00eas temperaturas, uma cor.<\/p>\n\n\n\n

That is why the source concludes that the tempering effect depends on the temperature and is largely independent of time, while the colour is only an empirical guide under definite conditions. On a tool steel the hardness that matters comes from the tempering temperature held for its prescribed time<\/a>, not from the shade on the surface. Colour is a field check for a shop that has no pyrometer, and it is a coarse one, since a polished face colours quickly, a scaled or rough one slowly, and a draught across the part shifts the reading.<\/p>\n\n\n\n

Para trabalhos que precisam manter uma faixa de dureza, use o cronograma publicado para o grau. Nosso Tabela de revenimento de a\u00e7o para ferramentas<\/a> fornece temperaturas de t\u00eampera e revenimento com a dureza resultante, e o guia de tratamento t\u00e9rmico de a\u00e7o ferramenta<\/a> cobre a sequ\u00eancia completa desde o recozimento at\u00e9 o revenimento final.<\/p>\n\n\n\n

Onde a cor de revenimento ainda \u00e9 usada<\/h2>\n\n\n\n

O m\u00e9todo da cor de \u00f3xido sobrevive em graus simples de carbono e de t\u00eampera em \u00f3leo, onde uma pe\u00e7a pequena \u00e9 revenida em forno aberto e o operador julga o acabamento a olho nu. A\u00e7o ferramenta O1<\/a> \u00e9 o grau usual para isso, e D2<\/a> \u00e9 o grau comum de trabalho a frio onde as mesmas cores ainda s\u00e3o vistas em uma face polida ap\u00f3s o revenimento. Para qualquer coisa carregada em servi\u00e7o, a tabela de temperatura contra cor \u00e9 um guia melhor que a tabela de tempo, porque \u00e9 lida contra o forno e n\u00e3o contra o rel\u00f3gio.<\/p>\n\n\n\n

Dados de refer\u00eancia relacionados<\/h2>\n\n\n\n

O gr\u00e1fico de temperatura contra cor est\u00e1 em nosso Tabela de cores de aquecimento do a\u00e7o<\/a>. Para a dureza que cada temperatura de revenimento produz em um grau espec\u00edfico, consulte o tabela de t\u00eampera<\/a> e o Tabela de Revenimento de A\u00e7o Ferramenta ao Carbono<\/a>.<\/p>\n\n\n\n

\n

Tabela de tempo por cor de revenimento, PDF para impress\u00e3o<\/strong><\/p>\n\n

Minutos para palha, marrom, roxo, azul escuro e azul claro de 200 a 275 graus C, em um PDF com nossos dados de contato.<\/p>\n\n

\n
Baixar PDF, 000 KB<\/a><\/div>\n\n<\/div>\n<\/div>\n\n\n\n

Fonte: The Heat Treatment of Tool Steel (Harry Brearley).<\/p>","protected":false},"excerpt":{"rendered":"

Temper Color Time Chart for Tool Steel Minutes at a constant temperature before a polished piece of steel reaches straw, brown, purple, dark blue and pale blue, from tests published in 1910. A reference summary of published practice and not an Aobo Steel specification. 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