AISI4140钢板-AISI4140钢板-AISI4140钢板

AISI4140厂家舞钢AISI4140执行标准AISI4140化学成分AISI4140是什么材质AISI4140价格

一、AISI4140钢板简介

AISI4140钢属于超高强度钢，具有高强度和韧性，淬火时变形小，淬透性较好，无明显的回火脆性，调质处理后有较高的疲劳极限和抗多次冲击能力，低温冲击韧性良好。该钢适宜制造要求一定强度和韧性的大、中型塑料模具，如机车牵引用的大齿轮、增压器传动齿轮、压力容器齿轮、后轴、受载荷极大的连杆及弹簧夹，也可用于 2000m以下石油深井钻杆接头与打捞工具，并且可以用于折弯机的模具等。

AISI4140也是合金结构钢，又称合结钢，是在碳素结构基础上加入合金元素，首先是提高了钢的淬透性，保证钢经过热处理后获得良好的综合机械性能，具有高的强度和足够的韧性。由于具有合适的淬透性，经适宜的金属热处理后，显微组织为均匀的索氏体、贝氏体或极细的珠光体，因而具有较高的抗拉强度和屈强比（一般在0.85左右），较高的韧性和疲劳强度，和较低的韧性－脆性转变温度，可用于制造截面尺寸较大的机器零件。

二、AISI4140执行标准和技术要求

AISI4140执行标准：WJX039-2005。

AISI4140技术要求：探伤、Z15-Z35厚度方向性能要求、高强度高韧性要求。

三、AISI4140交货状态交货期

AISI4140交货状态：热轧、控轧、正火、退火、高温回火等。

AISI4140交货期：正火（50天），高温回火（50天）,不正火（25天），退火（50天）。

四、AISI4140化学成分

五、AISI4140力学性能

六、AISI4140中合金元素作用

①增大钢的淬透性。淬透性是指钢淬火时，从表层起淬成马氏体层的深度，是取得良好综合性能的主要参数。除Co外，几乎所有合金元素如 Mn、Mo、Cr、Ni、Si和C、N、B等都能提高钢的淬透性，其中 Mn、Mo、Cr、B的作用最强，其次是Ni、Si、Cu。而强碳化物形成元素如 V、Ti、Nb等，只有溶于奥氏体中时才能增大钢的淬透性。

②影响钢的回火过程。由于合金元素在回火时能阻碍钢中各种原子的扩散，因而在同样温度下和碳素钢相比，一般均起到延迟马氏体的分解和碳化物的聚集长大作用，从而提高钢的回火稳定性,即提高钢的抗回火软化能力,V、W、Ti、Cr、Mo、Si的作用比较显著，Al、Mn、Ni的作用不明显。含有较高含量的碳化物形成元素如V、W、Mo等的钢，在500～600℃回火时，析出细小弥散的特殊碳化物质点如V4C3、Mo2C、W2C等,代替部分较粗大的合金渗碳体,使钢的强度不再下降反而升高,即出现二次硬化（见回火）。Mo对钢的回火脆性有阻止或减弱的作用。

③影响钢的强化和韧化。Ni以固溶强化方式强化铁素体；Mo、V、Nb等碳化物形成元素,既以弥散硬化方式又以固溶强化方式提高钢的屈服强度；碳的强化作用最显著。此外，加入这些合金元素，一般都细化奥氏体晶粒，增加晶界的强化作用。影响钢的韧性因素比较复杂，Ni改善钢的韧性；Mn易使奥氏体晶粒粗化，对回火脆性敏感；降低P、S含量，提高钢的纯净度，对改善钢的韧性有重要作用（见金属的强化）。

七、合金钢板的分类

1、根据热处理工艺的不同大体分为：

调质结构钢：许多重要零件如轴类、连杆、重要螺栓等，多是在承受很大的交变应力和冲击负荷等多种复合应力下工作，因此要求有较高的强度和韧性的综合机械性能。为了达到上述要求，钢件必须经过淬火及高温回火处理（即调质处理），淬火处理得马氏体组织，然后高温回火得到索氏体组织。调质钢的含碳量在0.3－0.5之间，碳量低不易淬硬，回火后得不到所需强度；碳量高则韧性低，在使用中发生脆性断裂。

表面硬化钢：制成的零件通过某种热片处理可以得到坚硬耐磨的表面层和柔韧适当的心部。如齿轮为了传递扭矩，必须有足够强度，在换挡过程中又承受冲击负荷，又要求有韧性，在啮合过程中，齿轮又承受强烈的磨损而就有耐磨性因此，齿轮应具有整体强度高和“表硬内韧”的性能。

2、按热处理工艺，主要有：

受用低碳钢渗碳淬火：含碳量一般在0.10－0.25之间，以保证零件心部有良好的韧性。作渗碳用的合结钢加入＜2铬、＜4.5镍、2锰、0.001－0.004硼，可以提高钢的淬透性，改善零件心部组织和性能外，还能提高渗碳层的强度和塑性；有时还加入微量的钛、钒等元素，起细化晶粒，防止渗碳时发生过热的影响。

采用渗氮处理：合结钢中含有铝的钢如38CrMoAL属渗氮钢。铝可和氮化合形成氮化铝，增加表面硬度和耐磨。

采用碳钢高频感应加热表层淬火：合金结构钢按治金质量分为优质钢和高级优质钢（钢号后加“A”）；用途分为压力加工（热压力加工或冷压力加工）和切削加工用钢；按供应状态分为不热处理、正火、退火或高温回火。

八、中国合金结构钢的牌号表示方法

①钢号开头的两位数字表示钢的碳含量，以平均碳含量的万分之几表示，其合金元素平均含量小于1．50％时，钢中仅标明元素，一般不标出含量，如40Cr。例：平均含量为1．50％～2．49％，2．50％～3．49％，相应写成2、3等。如碳含量为0．10％～0．17%，铬含量为0．60％～0．90％，镍含量为2．75％～3．25％的钢，用12CrNi3表示。

②钢中的钒V、钛Ti、铝AL、硼B、稀土RE等合金元素，均属微合金元素，虽然含量很低，仍应在钢号中标出。例如20MnVB钢中。钒为0.07-0.12%，硼为0.001-0.005%。  

③高级优质钢应在钢号最后加“A”，如12CrNi3A，特级优质钢加后缀“E”，如12CrNi3E，以区别于一般优质钢。

④专门用途的合金结构钢，钢号冠以(或后缀)代表该钢种用途的符号。例如冷镦和冷顶锻用钢(俗称“铆螺钢”)在牌号头部加前缀“ML”(“铆”、“螺’’两字汉语拼音字母的第一个字母组合)。保证淬透性用钢在牌号尾部加后缀“H”(“淬透性”的英文字“Hardenability”的第一个字母，与国际上常用的符号一致)。焊接用钢在牌号头部加前缀H，，(“焊”字汉语拼音字母的第一个字母)。非调质钢和易切削非调质钢在牌号头部加前缀“F”或“YF”(“非”字或“易非”字汉语拼音字母的第一个字母或组合)。

联系人：  喻尚

联系电话：0371-53377015/15639797063

舞钢地址：舞钢市经济产业园区建设路195号

郑州地址：郑州市航海路正商国际大厦9号0903室

AISI4140 factory wugang AISI4140 implementation standard AISI4140 chemical composition AISI4140 is what material AISI4140 price

I. introduction of AISI4140 steel plate

AISI4140 steel belongs to ultra high strength steel, with high strength and toughness, small deformation during quenching, good hardenability, no obvious temper brittleness, high fatigue limit and multiple impact resistance after quenching and tempering treatment, good low temperature impact toughness.The steel is suitable for manufacturing requires a certain strength and toughness of large and medium-sized plastic mold, such as locomotive traction with the big gear, the supercharger drive gear, pressure vessel, rear axle, gear load connecting rod and a spring clip, can also be used to under 2000 m deep well of oil drill pipe joint and the fishing tool, and can be used for bending machine mould, etc.

AISI4140 is also alloy structural steel, also known as alloy steel, is to add alloy elements on the basis of carbon structure, the first is to improve the hardenability of steel, ensure steel after heat treatment to obtain good comprehensive mechanical properties, with high strength and enough toughness.With suitable hardenability, after appropriate metal heat treatment, the microstructure is homogeneous sorbite, bainite or very fine pearlite, thus has higher tensile strength and showed (around 0.85), high toughness and fatigue strength, and low ductile to brittle transition temperature, can be used in the manufacture of section size larger machine parts.

Ii. AISI4140 implementation standards and technical requirements

AISI4140 standard: wjx039-2005.

AISI4140 technical requirements: flaw detection, z15-z35 thickness direction performance requirements, high strength and high toughness requirements.

Iii. Delivery time of AISI4140

Delivery status: hot rolling, controlled rolling, normalizing, annealing, high temperature tempering, etc.

Delivery time: normalizing (50 days), high-temperature tempering (50 days), unnormalizing (25 days), and annealing (50 days).

4. Chemical composition of AISI4140

Carbon (C) manganese (Mn) phosphorus (P) sulfur (S) nickel (Ni) chromium (Cr)

0.38 ~ 0.43 0.75 1.00 0.030 0.040 0.030 or less or less or less 0.80 ~ 1.10

5. Mechanical properties of AISI4140

Tensile strength b (MPa) yield strength s (MPa) elongation 5 (%) section shrinkage (%) impact energy Akv (J) impact toughness value kv (J/cm2) hardness

1080(110) 930(95) 12 45 63 78(8) 217HB

Vi. Role of alloying elements in AISI4140

Increase the hardenability of steel.Hardenability refers to the depth at which the martensite layer is quenched from the surface during the quenching of steel, and is the main parameter for obtaining good comprehensive properties.In addition to Co, almost all alloying elements such as Mn, Mo, Cr, Ni, Si, C, N, B, etc. can improve the hardenability of steel, among which Mn, Mo, Cr, B have the strongest effect, followed by Ni, Si, Cu.However, strong carbide forming elements such as V, Ti, Nb, etc. can only increase the hardenability of steel when dissolved in austenite.

Influence the tempering process of steel.Due to the alloy elements on tempering can hinder the diffusion of atoms in steel, and compared under the same temperature and carbon steel, general rise to delay the decomposition of martensite and carbide gathered grew up effect, so as to improve the tempering stability of steel, namely improve steel tempering softening resistance, V, W, Ti, Cr, Mo, Si effect is more significant, the effect of Al, Mn, Ni is not obvious.Contain higher content of carbide forming elements such as V, W, Mo, such as steel, during 500 ~ 600 ℃ tempering, precipitate fine dispersion of special carbide particles such as V4C3, Mo2C and W2C, replace part of the relatively bulky alloying cementite, decrease the strength of the steel is no longer increase, namely a double-dip sclerosis (see drawing).Mo can prevent or weaken the temper brittleness of steel.

(3) the impact of steel strengthening and toughening.Ni strengthened ferrite by solid solution strengthening;Mo, V, Nb and other carbide forming elements improve the yield strength of steel by means of both dispersion hardening and solid solution strengthening.The strengthening effect of carbon is the most significant.In addition, the addition of these alloying elements generally refines the austenite grains and enhances the grain boundary.The factors affecting the toughness of steel are complex, and Ni can improve the toughness of steel.Mn tends to coarsen austenite grains and is sensitive to temper brittleness.Reducing P and S content and improving the purity of steel play an important role in improving the toughness of steel (see strengthening of metal).

Classification of alloy steel plates

1. According to the different heat treatment processes, it can be divided into:

Tempered structural steel: many important parts such as shafts, connecting rods, important bolts, etc., are under a lot of alternating stress and impact load and other complex stress work, so the requirement of high strength and toughness of the comprehensive mechanical properties.In order to meet the above requirements, the steel must undergo quenching and high-temperature tempering treatment (that is, quenching and tempering treatment), quenching and treatment to martensite structure, and then high-temperature tempering to get the sorbite structure.The carbon content of quenched and tempered steel is between 0.3 and 0.5, low carbon content is not easy to harden, and the strength required after tempering is not obtained.High carbon content leads to low toughness and brittle fracture in use.

Surface hardened steel: parts made of a certain hot sheet treatment can be hard wear resistant surface layer and a suitable flexible heart.For example, in order to transfer torque, gear must have enough strength, in the shift process and bear the impact load, but also requires toughness, in the meshing process, gear and bear strong wear and wear resistance, therefore, gear should have high overall strength and "table hard inside tough" performance.

2. According to the heat treatment process, there are:

Carburizing and quenching of low carbon steel: the carbon content is generally between 0.10 and 0.25, so as to ensure the parts of the heart has good toughness.The addition of < 2 chromium, < 4.5 nickel, 2 manganese and 0.001-0.004 boron to the cementitious composite steel for carburizing can improve the hardenability of the steel, the core structure and properties of the parts, as well as the strength and plasticity of the carburized layer.Sometimes also add trace titanium, vanadium and other elements, from refining grain, prevent carburizing when the impact of overheating.

Nitriding treatment: combined steel containing aluminum steel such as 38CrMoAL nitriding steel.Aluminum can be combined with nitrogen to form aluminum nitride, increasing surface hardness and wear resistance.

Surface quenching with high frequency induction heating of carbon steel: alloy structural steel is divided into high quality steel and high quality steel according to the quality of the alloy (add "A" after the steel number);USES are divided into pressure machining (hot pressure machining or cold pressure machining) and cutting steel;According to the state of supply, non - heat treatment, normalizing, annealing or high temperature tempering.

Method for designation of Chinese alloy structural steel

The two Numbers at the beginning of the steel number represents the carbon content of steel, with the average carbon content of several parts per million, the average content of its alloy elements is less than 1.When 50%, only elements are marked in the steel, generally no content is marked, such as 40Cr.The average content is 1.50% ~ 2.49%, 2.50% ~ 3.49%, write 2, 3, etc.If the carbon content is 0.10% ~ 0.17%, chromium content is 0.60% ~ 0.90%, nickel 2.75% to 3.25% steel, 12CrNi3.

Steel vanadium V, titanium Ti, aluminum AL, boron B, RE and other alloy elements, are microalloy elements, although the content is very low, should still be marked in the steel.For example, in 20MnVB steel.Vanadium is 0.07-0.12% and boron is 0.001-0.005%.

High quality steel should be in the steel number at the end of "A", such as 12CrNi3A, super quality steel with suffix "E", such as 12CrNi3E, to distinguish from the general high quality steel.

(4) special purpose alloy structural steel, steel number with (or suffix) represents the use of the symbol.For example, cold heading and cold top forging steel (commonly known as "riveting steel") is prefixed with "ML" (the first letter combination of Chinese pinyin letters of "riveting" and "snail") on the head of the brand.To ensure the Hardenability, the suffix "H" (the first letter of the English word "Hardenability" of "Hardenability" is the same as the symbol commonly used in the world) is added to the end of the brand with steel.The head of the plate shall be prefixed with steel H,, (the first letter of the Chinese phonetic alphabet of "welding").Non-quenched and tempered steel and free-cutting non-quenched and tempered steel shall be prefixed with "F" or "YF" (the first letter or combination of the Chinese phonetic alphabet of "fei" or "yifei") at the head of the mark.