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CHEMICAL COMPOSITION AS PER DIN
GradeCSiMnPSCrNiMoV 1./56NiCrMoV70.50-0.600.1-0.40.65-0.95&#;0.03&#;0.031.0-1.21.50-1.80.45-0.550.07-0.12EQUIVALENT NATIONAL GRADE
As a member of hot work die steel, 1. steel is highly affirmed by technical engineers all over the world for its excellent hot workability, and has developed similar grades that meet the needs of their respective countries.
StandardGradeCSiMnPSCrNiMoV ASTM A681AISI L6 0.65-0.750.1-0.50.25-0.80&#;0.03&#;0.030.6-1.21.25-2.0&#;0.50&#; EN ISO NiCrMoV70.50-0.600.1-0.40.60-0.90&#;0.03&#;0.020.8-1.21.50-1.80.35-0.550.05-0.15 JIS GSKT40.50-0.600.1-0.40.60-0.90&#;0.03&#;0.020.8-1.21.50-1.80.35-0.550.05-0.15Ingot Quality Control
When we forge 1. steel, the first consideration is the quality of the forged steel ingot, which requires us to choose a suitable steelmaking process to control the quality of the billet.
The ingot process for 1./56NiCrMoV7 as below:
Electric Arc Furnace(EAF)&#;Secondary Refining(LF)&#; Vacuum Decarburization(VD)&#;Ingot Casting
Forging Temperature Control
Forging Deformation
When we consider the amount of forging deformation, the first thing that comes to mind is the forging ratio.Through the forging process, an appropriate forging ratio can promote the bubbles, porosity, and micro-cracks in the steel ingot to be welded under the action of compressive stress, and the material density is improved.
For 1. steel,we usually control the forging ratio with Upsetting and Drawing Process,and guarantee it above 4:1
DIN1. Steel Hot Foring with T Forging Press
Post-Forging Treatment
The conventional treatment method is to bury the forged 1. steel in the sand pit for heat preservation, the purpose is to let the material cool down slowly to prevent cracks.
But for 1. steel that is sensitive to white spots, in order to prevent white spots from being produced during the cooling process, dehydrogenation heat treatment should be done in time to allow the hydrogen inside the material to fully diffuse and escape.
DIN 1./56NiCrMoV7,as Chromium-nickel-molybdenum-vanadium alloy hot work die steel, is known for stable performance.As a special steel grade in hot work die steel, we certainly want to learn more about this particular kind of steel to properly figure more out about it.
Reading our guide,we will guide you to a better and deeper understanding of what 1. steel is, so as to help you choose steel from a more comprehensive perspective.
Hot work tool steel refers to alloy tool steel suitable for making molds for thermal deformation processing of metals, such as hot forging dies, hot extrusion dies, die-casting dies, and hot upsetting dies.
Since hot working molds work under high temperature and high pressure conditions for a long time&#;Therefore, mold materials are required to have high strength, hardness and thermal stability,especially should have high thermal strength, thermal fatigue, toughness and wear resistance.
Hot Work Tool Steel Application
The hot work mold bears a great impact when it is working. The mold cavity is in contact with high-temperature metal and repeated heating and cooling cycles. It can be said that its use conditions are extremely harsh. In order to meet the requirements of the hot work die, the hot work tool steel should have the following basic characteristics:
General Hot Work Tool Steel Classification
What Is The Hardness For 1. Steel?
Normally, 1. hot work tool steel is used in heat treatment condition.High hardness will be obtained after quenching and tempering.
1. steel will generally be pre-hardened to hardness range of 38-53HRC
The application of specific hardness is roughly as follows&#;
What Is The Tensile Strength of 1. Steel?
After quenching and tempering heat treatment, 1. steel not only obtained high hardness, correspondingly also obtained high strength.
With hardness 380-420HB,The corresponding tensile strength is from to Mpa.
Can 1. Steel Be Water Quenched?
1. steel can be water quenched, but as alloy tool steel, The rapid cooling rate of water quenching leads to an increase in the internal stress of the material, and an increase in the tendency of deformation and cracking.
As 1. steel with high hardenability, it is more suitable for oil with a slow cooling rate as a quenching medium.
How Is The Hardenability of 1. Steel?
The hardenability of steel mainly depends on its chemical composition, especially containing alloying elements that increase hardenability. The steel with good hardenability can make the whole section of the steel part obtain uniform mechanical properties.
1. steel has such good hardenability.The Cr. Ni. Mo element is added to 1. steel, mainly to improve the hardenability of the steel, especially when working together, the hardenability is significantly improved.
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For example, a mold of 300mm x 300mm x 400mm can be thoroughly hardened, and the hardness of the entire section is uniform.
Can 1. steel Be Machined Easily?
It depends on the heat treatment condition when machining 1. steel.With annealed condition,hardness will below 248HB,it is relatively easy to process.
While after quenched and tempered conditin,harness will exceed 380HB,it is difficult to do turning processing on 1. steel.Fortunately, superhard tool materials, such as CBN tools and PCD tools, can be used to solve this situation.
How To Check Internal Defects of 1. Steel?
The most cost-effective way is ultrasonic testing, which has proven its value.White spots and cracks, the most dangerous defects in the material, can be directly judged by ultrasonic testing. The pores, looseness and non-metallic inclusions in the material can also be tested by ultrasonic to determine whether they exceed the standard.
Ultrasonic Testing Principle Diagram
How To Annealing 1. Steel?
Although the annealing time is long and the production efficiency is low, 1. steel needs to be annealed under certain circumstances.
Improve or eliminate various structural defects and residual stress caused by 1. steel during forging,rolling and straightening, and prevent material deformation and cracking.
Generally, the stress relief annealing temperature is controlled at 450-500°C,the temperature of stress relief annealing should generally be 20~30&#; lower than the last tempering temperature, so as not to reduce the hardness and mechanical properties.
Also refers to Recrystallization Annealing.Refine the internal grains of 1. steel, uniform structure to improve its mechanical properties, reduce its surface hardness for machining, and prepare the structure for final heat treatment (quenching & tempering).
The complete annealing temperature of 1. steel is controlled at 760-780°C, and the heating rate usually does not exceed 100°C/hour.The holding time should be determined according to the workpiece shape, size,original structure state, furnace capacity, heating equipment and other factors. Generally, it can be calculated according to the thickness of the workpiece for one hour per 20 mm.
The cooling after annealing should be sufficiently slow, and furnace cooling can be used, and the annealing hardness for 1. steel is below 229HB.
How To Quenching And Tempering 1. Steel?
As a member of hot work tool steel, 1. steel is often used in high temperature and harsh working environment, so its performance requirements are high. This requires us to quench and temper it to meet various performance requirements.
From the consideration of quenching medium, our priority is oil.The cooling effect is slower than that of water, which can prevent quenching cracking and serious deformation.
The quenching temperature of 1. steel should be selected within the temperature range where the austenite grains do not grow, generally controlled between 840-860°C. When heating, it needs to be preheated once or twice to ensure uniform heating.
The selection of the holding time should ensure the completion of the structural transformation and the degree of solid solution of the alloying elements. If the holding time is too short, the thermal hardness and tempering resistance of 1. steel will be reduced.
The tempering of 1. steel should be carried out immediately after quenching.The tempering time should be sufficient, otherwise the hardness of the core of the material will be high, which will easily cause cracking
When cooling after tempering, attention should be paid to prevent the second type of temper brittleness,and at the same time perform secondary tempering. The tempering temperature is about 10°C lower than the first tempering temperature, and the holding time can be shortened by 20%-25%.
1. Steel Hardness Vs Tempering temperature
Tempering Temperature,&#;400---650 Hardness,HRC42---36Chemical Composition Comparison
GradeCSiMnPSCrNiMoV 1./56NiCrMoV70.50-0.600.1-0.40.65-0.95&#;0.03&#;0.031.0-1.21.50-1.80.45-0.550.07-0.12 1./55NiCrMoV60.50-0.600.1-0.40.65-0.95&#;0.03&#;0.030.6-0.81.50-1.80.25-0.350.07-0.12From the above table,we can see the biggest difference lies in the content of Cr and Mo.Due to composition factors, the manufacturing cost of 1. steel is slightly higher than that of 1. steel, but the performance of the two is very close.1. steel can be regarded as an upgraded version of 1. steel.
Heat Treatment Data Comparison In Quenched and Tempered Condition
GradeQuenching Temperature,°CQuench MediumTempering Temperature,°CHardness after Tempering,HRC 1./56NiCrMoV-870Principal Applications Comparison
DIN 1./55NiCrMov6 and DIN 1./56NiCrMoV7 both belong to hot workng tool steel group,you can know from the grade name, they are very close in all aspects,but still a bit different, for example, in the application,they have different focuses.
1. tool steel is mainy used for hammer forging dies for medium and small dimensions,while 1. tool steel focus on hammer forging dies up to the largest dimensions,particularly also with heavy embossing; part dies, die holders, plungers for extrusion presses.
WHERE CAN YOU BUY HIGH-QUALITY 1. STEEL?
When you do everything possible to buy high-quality 1. steel but you are struggling to find a suitable manufacturer, we are here-Fuhong Steel!
We are a manufacturer of the highest quality special steel. We can fully meet your needs for 1. steel, which stems from our rich manufacturing experience and strict quality control system.
What We Supply For DIN 1./56NiCrMoV7 Steel
Supply FormSize(mm)ProcessToleranceHeat Treatment:Annealed(+A),Quenched & Tempered(+QT)
Machining:Turning/Milling/Drilling/Peeling/Polishing
The company is the world’s best 1. steel supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.