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高鉻鑄鐵的標准，高鉻鑄鐵的牌號、化學成分及硬度

发布时间：2021-04-19 06:30:29 点击次数：4104

　　高铬铸铁是高铬白口抗磨铸铁的简称，是一种性能优良而受到特别重视的抗磨材料。它以比合金钢高得多的耐磨性，和比一般白口铸铁高得多的韧性、强度，同时它还兼有良好的抗高温和抗腐蚀性能，加之生产便捷、成本适中，而被誉为当代最优良的抗磨料磨损材料之一。因此生产高铬铸铁的铸造厂很多，下面介绍一下高鉻鑄鐵的標准，高鉻鑄鐵的牌號、化學成分及硬度。

高鉻鑄鐵的標准，高鉻鑄鐵的牌號、化學成分及硬度

　　我國抗磨白口鑄鐵國家標准(GB/T8263)規定了高鉻白口鑄鐵的牌號、成分、硬度及熱處理工藝和使用特性。其典型成分及工藝如下表：

　　表1 高铬铸铁的牌号及化学成分(%)

　　牌號CMnSiNiCrMoCuPS

　　KmTBCr122.0-3.3≤2.0≤1.5≤2.511.0-14.0≤3.0≤1.2≤0.10≤0.06

　　KmTBCr15Mo2.0-3.3≤2.0≤1.2≤2.511.0-18.0≤3.0≤1.2≤0.10≤0.06

　　KmTBCr20Mo2.0-3.3≤2.0≤1.2≤2.518.0-23.0≤3.0≤1.2≤0.10≤0.06

　　KmTBCr262.0-3.3≤2.0≤1.2≤2.523.0-30.0≤3.0≤1.2≤0.10≤0.06

　　表2 高铬铸铁的硬度

　　牌號鑄態或去應力處理硬化態或硬化態去應力處理軟化退化態

　　HRCHBWHRCHBWHRCHBW

　　KmTBCr12≥46≥450≥56≥600≤41≤400

　　KmTBCr15Mo≥46≥450≥58≥650≤41≤400

　　KmTBCr20Mo≥46≥450≥58≥650≤41≤400

　　KmTBCr26≥46≥450≥56≥600≤41≤400

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"Because," was the reply, "it is, or was, the entrance to the land of gold. It was so named after the discovery of gold in California, and until he completion of the Overland railway it was the principal pathway to the country where everybody expected to make a fortune." "As you see, this is from the solicitor who employs you," he said. "If I like to change my mind, and ask you to go you are to obey. I ask you to go. Say nothing of this, and I will see you are suitably rewarded in the morning." We waited in the street for two of the soldiers who went to fetch the old man. After waiting a good while the poor wretch appeared between them. He wept profusely, and between his loud sobs affirmed repeatedly that he was innocent, that he did not know me, that I told him I was a Netherland journalist, and so on, and so on: "Oh, gentlemen!—oh, gentlemen!" he exclaimed, "I must not leave my little boy ... my laddie; ... he is quite alone.... Oh, let me go!" ... I was not afraid of an inquiry, but asked for it as a matter of fact, by writing in my report:— look at me you can say, `I gave that Very Useful Person to the world.' nourishing meals). A far higher place must be assigned to Judaism among the competitors for the allegiance of Europe. The cosmopolitan importance at one time assumed by this religion has been considerably obscured, owing to the subsequent devolution of its part to Christianity. It is, however, by no means impossible that, but for the diversion created by the Gospel, and the disastrous consequences of their revolt against Rome, the Jews might have won the world to a purified form of their own monotheism. A few significant circumstances are recorded showing how much influence they had acquired, even in Rome, before the first preaching of Christianity. The first of these is to be found in Cicero’s defence of Flaccus. The latter was accused of appropriating part of the annual contributions sent to the temple at Jerusalem; and, in dealing with this charge, Cicero speaks of the Jews, who were naturally prejudiced against his client, as a powerful faction the hostility of which he is anxious not to provoke.330 Some twenty years later, a great advance has been made. Not only must the material interests of the Jews be respected, but a certain conformity to their religious prescriptions is considered a mark of good breeding, In one of his most amusing satires, Horace tells us how, being anxious to shake off a bore, he appeals for help to his friend Aristius Fuscus, and reminds him of217 some private business which they had to discuss together. Fuscus sees his object, and being mischievously determined to defeat it, answers: ‘Yes, I remember perfectly, but we must wait for some better opportunity; this is the thirtieth Sabbath, do you wish to insult the circumcised Jews?’ ‘I have no scruples on that point,‘ replies the impatient poet. ‘But I have,’ rejoins Fuscus,—‘a little weak-minded, one of the many, you know—excuse me, another time.‘331 Nor were the Jews content with the countenance thus freely accorded them. The same poet elsewhere intimates that whenever they found themselves in a majority, they took advantage of their superior strength to make proselytes by force.’332 And they pursued the good work to such purpose that a couple of generations later we find Seneca bitterly complaining that the vanquished had given laws to the victors, and that the customs of this abominable race were established over the whole earth.333 Evidence to the same effect is given by Philo Judaeus and Josephus, who inform us that the Jewish laws and customs were admired, imitated, and obeyed over the whole earth.334 Such assertions might be suspected of exaggeration, were they not, to a certain extent, confirmed by the references already quoted, to which others of the same kind may be added from later writers showing that it was a common practice among the Romans to abstain from work on the Sabbath, and even to celebrate it by praying, fasting, and lighting lamps, to visit the synagogues, to study the law of Moses, and to pay the yearly contribution of two drachmas to the temple at Jerusalem.335 Jeff drew a bulky, registered envelope from his coat, displayed the registration stamps and marks, and his name and address typed on the envelope. Drawing out a half dozen hand written sheets in a large masculine “fist,” he showed the signature of Atley Everdail at the end. “Didn’t she suspect any trick—was there a trick?” As he reached for the letter, and searched on the fourth page, all three of his listeners were holding their breath in suspense. The nose came up steadily—with a fraction of time to the good, they began to come out of the glide to level flight. We must now step back a little to observe the war on the Continent from the opening of the present campaign. Frederick of Prussia lay encamped during the winter in Silesia, surrounded by difficulties and enemies. His resources both in[170] money and men appeared well nigh exhausted. The end of autumn, 1760, brought him the news of the death of George II., and, from what he could learn of the disposition of his successor and his chief advisers, it was certain that peace would be attempted by England. This depressing intelligence was confirmed in December by the British Parliament indeed voting again his usual subsidy, but reluctantly, and he found it paid with still more reluctance and delay. Whilst thus menaced with the total loss of the funds by which he carried on the war, he saw, as the spring approached, the Russians and Austrians advancing against him with more than double his own forces. Disasters soon overtook him. The capture of Schweidnitz enabled the Austrians to winter in Silesia, which they had never yet done during the war; and the Russians also found, to their great satisfaction, on arriving in Pomerania, that they could winter in Colberg. The Russian division under Romanzow had besieged Colberg both by land and sea, and, despite the attempts of the Prussians sent by Frederick to relieve it, it had been compelled to surrender. In these discouraging circumstances Frederick took up his winter quarters at Breslau. His affairs never wore a darker aspect. He was out-generaled and more discomfited this campaign than by a great battle. His enemies lay near in augmented strength of position, and his resources had ominously decreased. "Fall in in two ranks, with the right here," shouted Si. IT DID not seem that so many dangers beset the possession of a cow as of a horse, yet the Deacon prudently rose while it was yet dark to look after the animal. A wordy war ensued, but the first-comer was stalwart and determined. The row waked up Shorty, who appeared with an ax. "Yes, I am," said Si, saluting as stiffly as he dared. "What's the matter?" "Well, I'm afraid it 'll be a short roll I'll have to call this evening," said the Orderly, with a sorrowful expression. "I suppose we'd better go back through that brush and look up the boys that were dropped." MRS. G.: We found out that people have been talking from other places, too. Downtown and even in the suburbs. "No—no—I can't—I won't!" Towards the end of August, Reuben asked Rose to marry him. 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