你跟臭鸟的差异有多大？大到你自己都不知道，
假如我告诉你，今天在法国有个活儿可以干，有利润的，你去吗？在澳洲有活儿，在鸟国有活，你去吗？今天的家伙肯定不去，今天我们谈类似事情，我说，1990年，我们就面临这个，奔波在全世界，为了大公司能顺利生存，做约旦的小钢厂，哈哈，你想不到吧，约旦也轧钢，还要求挺高的呢，一部分玩自动化的，给海雕改造转炉，做世界上任何地方需要的钢厂方案，有棒材的，线材的，小热带的，都有，
那时，除去正式的商业合同以外，其它都没有打字的过程，都是手写的，包括合同附件，工整写好中英文，复印多份，附在合同后面，就这个状态，也一样有大合同，也有巨量的米进帐，一年源源不断，大量的米进了总公司，哈哈，当然，许多被糟蹋了，这点，阿拉在底特律码头都看见了，哈哈，国家就是如此，个人不能完全左右，你能做的，就像小霍一样，带4万匈奴俘虏回来，具体武帝是不是糟蹋银子，那是人家的事情了，哈哈，
海雕臭鸟会像我们一样拼命吗？大部分时间不必，
4340强度不行的时候，英扣儿的基尼会跳出来，问，怎么不行了？哪里不行了？人家说，回火温度低了，脆性大，很难处理，回火温度高了，马氏体分解了，强度不够了，人家一捉摸，说，加硅阻碳，
这问题就解决了，那是1952年，300M此后一直横行，几十年以后，我们也仿制出来了，当然，至今性能不稳定，今天也还是从鸟公司进口，30 年以后，鸟自己发现300M的各种问题了，问题累计以后，1992年Carpenter公司的基尼就开发出Aermet 100，就解决了大部分问题，而腐蚀等问题依然还有，此时，就会有比卡公司小的多的公司出来出来这些问题，你看那公司小吧，几十个鸟，就处理了Aermet 100问题，公司小没关系，依然有大号的基尼，
而中国不是这个状态，我们没有大量的基尼，我还做博弈的岁月，就懂这个，硕大的公司，关键时候，没有一个敢出头的，公司有无数的大专家，小型厂生产几十年，无数NB人物平常都是傲视一切的，此时没有吭声的，
世界没有活儿干吗？不是，是你不敢出去玩，是没有你能玩的了的东西吗，也不是，是你玩不出来，你不会玩，
这就是华人跟鸟的区别，你晚上到酒吧坐一下，发现周围都是鸟，各种各样的鸟，唯一一个共同点，你一听说话，就知道，来自鸟国，
不扯淡了，今天在欧洲有项目，你去吗，哈，这是实质问题吧，你怎么说 ，为了生活，你去不去，你千万别跟人家说，我跟你去，哈哈，
我跟你去，是最没有价值的一句话，我教你说，爷我去，哈哈，
我准备开个贴系列讲讲不为人知的鸟的工业公司，好多鸟的公司都没有进入中国市场。汉语环境中没有人这玩意，我能在汉语环境找到蛛丝马迹都是因为资本相关的，因为国人最喜欢谈钱，只能去鸟公司的官网或者协会、组织查。 八爷，有空讲讲基尼是怎么厉害起来的。
中国十四亿人口，按比例，应该出很多基尼啊。贸易战打到这程度，有没有可能把他们召集起来玩。或者像斯大林对科学家的那种模式。 硅不能形成碳化物，有强烈的促进碳的石墨化作用，在硅含量较高的中碳和高碳钢中，如不含有强碳化物形成元素，易在一定温度条件下发生石墨化； 老板找伙计来是为了顶上去的战斗的。养兵千日用兵一时的 Steven_ME 发表于 2019-6-6 12:00
硅不能形成碳化物，有强烈的促进碳的石墨化作用，在硅含量较高的中碳和高碳钢中，如不含有强碳化物形成元素 ...
Silicon’s primary role in steel making is as a deoxidizer. It makes steel sound, by removing oxygen bubbles from the molten steel. The percentage of silicon in the analysis was related to the type of steel, rimmed and capped steels (made by the ingot method) had no silicon intentionally added. Semi-killed steels typically contained up to 0.10% max silicon, and fully killed steels could have up to 0.60% maximum. Commercial practice in the US and Canada throughout my career was 0.15-.35 % silicon in SAE carbon and alloy steels.
In addition to deoxidiation silicon also influences the steel five different ways:
Silicon helps increase the steel’s strength and hardness, butis less effective than manganese in these functions.
In electrical and magnetic steels, silicon helps to promote desired crystal orientations and electrical resistivity.
In some high temperature service steels, silicon contributes to their oxidation resistance.
Inalloy grades, silicon also increases strength (but not plasticity!) when quenched and tempered.
Silicon also has a moderate effect on hardenability of steel.
But there are always less desireable aspects of any element in an alloy
Silicon is detrimental to surface quality in low carbon steels, a condition that is especially magnified in low carbon resulfurized steels.
Silicon is detrimental to tool life in machining as it forms hard abrasive particles which increase tool wear and thus lower the steel’s machinability.
Bottom line, on plain carbon and alloy bar steels, silicon contents of 0.10, 0.15-.35 weight percent are typical; On resulfurized , and resufurized and rephosphorizedfree machining steels, silicon analysis above 0.02 wt % is cause for concern, due to potential surface quality and certain tool life issues. 本帖最后由 茉莉素馨 于 2019-6-6 14:31 编辑
300M Steel
Alloy 300M is basically a silicon-modified (1.6% Si) 4340 steel, but it has slightly higher carbon and molybdenum
contents and also contains vanadium. This steel exhibits deep hardenability and has ductility and toughness at tensile
strengths of 1860 to 2070 MPa (270 to 300 ksi). Many of the properties of this steel are similar to those of 4340 steel,
except that the increased silicon content provides deeper hardenability, increased solid-solution strengthening, and better
resistance to softening at elevated temperatures. Compared to 4340 of similar strength, 300M can be tempered at a higher
temperature, which provides greater relief of quenching stresses. The so-called 260 °C (500 °F) embrittlement is
displaced to higher temperatures. Because of the high silicon and molybdenum contents, 300M is particularly prone to
decarburization. During thermal processing, care should be exercised to avoid decarburization, or the decarburized layer
should be removed after processing. When heat treated to strength levels higher than 1380 MPa (200 ksi), 300M is
susceptible to hydrogen embrittlement. If the steel is properly baked after plating, the resulting improvement in properties
is better than that for 4340 or D-6ac steel of equal strength.
The steel 300M is forged at 1065 to 1095 °C (1950 to 2000 °F). Forging should not be continued below 925 °C (1700 °F).
After forging, it is preferred that parts be slowly cooled in a furnace, but they may be allowed to cool in air in a dry place.
Although 300M can be readily gas or arc welded, welding is generally not recommended; welding rod of the same
composition should be used. Because 300M is an air-hardening steel, parts should be either annealed or normalized and
tempered after welding. The machinability rating of annealed 300M is about 45% (B1112, 100%). A partially
spheroidized structure, obtained by normalizing and then tempering at 650 to 675 °C (1200 to 1250 °F), gives optimum
machinability.
Typical applications of 300M, which is available as bar, sheet, plate, wire, tubing, forgings, and castings, are aircraft
landing gear, airframe parts, fasteners, and pressure vessels.
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