淬火出来的工件需要带温回火？
1. Do quenched workpieces need to be tempered with temperature?
这种做法是不可取的，要根据钢种的马氏体转变点来决定淬火之后的回火前的入炉温度！为了防止淬火开裂，不能妄加推测，一概而论的采用带温回火的办法！
This
practice is not advisable. The furnace entry temperature after
quenching and before tempering shall be determined according to the
Martensite transformation point of the steel grade! In order to prevent
quenching cracking, we cannot speculate recklessly and adopt the method
of tempering with temperature as a general rule!
2、淬火出来的工件没有冷到室温，不能定进行回火？
2. The quenched workpiece has not cooled to room temperature and cannot be tempered?
有些人认为淬火出来后，还没有冷却到室温时，不能进入回火工序。实际上很多钢种，不算高、中碳钢，其马氏体转变终了点大都高于室温，冷到室温时，反而容易开裂，淬火出来后就可以尽不慢转入回火工序。
Some
people believe that after quenching, the tempering process cannot be
entered before it has cooled to room temperature. In fact, many kinds of
steels, not including high and medium carbon steels, have Martensite
transformation end points that are higher than room temperature. When
they are cooled to room temperature, they are easy to crack. After
quenching, they can be transferred to tempering process as soon as
possible.
3、大型铸钢件加工已经全部完成，要求热处理确定不变形？
3. The processing of large steel castings has been fully completed, and heat treatment is required to ensure no deformation?
有的人为了节省产品加工费用，在热处理之前，把所有的尺寸加工结束，然后去热处理淬火回火。要求热处理者确定在热处理过程中不变形，或者允许变形量在末冷加工的公差带值内。
Some
people, in order to save on product processing costs, finish machining
all dimensions before heat treatment, and then go to heat treatment,
quenching, and tempering. Require the heat treater to ensure that there
is no deformation during the heat treatment process, or that the
allowable deformation is within the tolerance zone value of the final
cold working.
大型铸钢件在铸造之前是需要做一些准备工作的，那大家知道有什么吗？下面，为你详细介绍一下：
Do you
know what preparations need to be made for large steel castings before
casting? Below, let me give you a detailed introduction:
1、浇注前铸型周围应尽可能清洁平整，去掉与铸型无关的工具和工具，并预先设置紧急疏散通道，以确定浇注人员的稳定。
1.
Before pouring, the surrounding of the casting mold should be as clean
and flat as possible, tools and tools irrelevant to the casting mold
should be removed, and Emergency evacuation channels should be set in
advance to ensure the stability of pouring personne
