X20Cr13 and X30Cr13 steel both belong to the European standard EN10088. As the representative steels of high chromium stainless steels,they both belong to martensitic stainless steels and have good machining performance.

After heat treatment(quenching and tempering),they all have excellent corrosion resistance,polishing properties,and high strength and wear resistance.However, in comparison, on the basis of the same chromium content, X20Cr13 has a lower content, which means that the corrosion resistance is relatively high and the strength is relatively low.The hardness of X30Cr13 is relatively high, and it is more suitable for the manufacture of plastic molds that are subjected to high load, high wear resistance and corrosive media.

X30Cr13/DIN 1.4028 Stainless round bar

WHAT DOES X20Cr13 | X30Cr13 MEAN?

To solve this problem, we must first understand the naming rules of stainless steel in Germany,and then we will briefly talk about it.

According to the DIN 17006 system steel number representation method, an element in the steel above 5% is called high alloy steel, and the steel number begins with the letter X,followed by a number representing the average carbon content of the steel and the chemical symbols of the alloying elements which are sorted by content.the last is the average percentage value of the content of each main alloying element (rounded to an integer).

For example: X10CrNi18-8 means stainless steel with w(C) of 0.10%, w(Cr) of 18% and w(Ni) of 8%

Here X20Cr13 and X30Cr13,According to the above rules, we know that X20Cr13 and X30Cr13 contain an average carbon content of 0.2% and 0.3% respectively with Cr content of about 13%.

Another representation method is the digital steel number representation method of the DIN17007 system.It is represented by 7 digits, and its general form is shown as follows

X    XXXX   XX

The first number X indicates the material category, the 2nd-5th XXXX indicates the steel grade group, and the 6th and 7th numbers XX are additional numbers indicating the steel’s manufacturing method and heat treatment state.

Among the numbers indicating the steel grade group, the most important are the second and third digits.The 4th and 5th digits have no certain rules, or are distinguished by carbon content or alloy content.

40 to 45 represent stainless steel groups, and their specific meanings are as follows

  • 40——Ni<2.5%, without Mo, Nb and Ti
  • 41——Ni<2.5%, with Mo, without Nb and Ti
  • 43——Ni≥2.5%, without Mo, Nb and Ti
  • 44——Ni≥2.5%, with Mo, without Nb and Ti
  • 45——contains special added elements

In this article, the digital code for X20Cr13 is 1.4021, while the digital code for X30Cr13 is 1.4028.

X20Cr13 | X30Cr13 STEEL CHEMICAL COMPOSITION

GradeCSiMnPSCr
X20Cr13/1.40210.16-0.25≤1.0≤1.5≤ 0.04≤ 0.01512-14
X30Cr13/1.40280.26-0.35≤1.0≤1.5≤ 0.04≤ 0.01512-14

X20Cr13 | X30Cr13 STEEL EQUIVALENT GRADE

X20Cr13X30Cr13
China20Cr13/2Cr1330Cr13/3Cr13
USA420/S42000420/S42000
JapanSUS420J1SUS420J2

X20Cr13 | X30Cr13 STEEL PHYSICAL PROPERTY

X20Cr13/1.4021X30Cr13/1.4028
Density, g/cm37.757.76
Ac1,℃820780
Ar1,℃820780
Ms,℃300-350240
Melting point,℃1470-15101365
Specific heat capacity,(0~100℃),kj/(kg.k)0.460.47
Thermal conductivity W/(m.K)100℃500℃100℃500℃
22.226.425.125.5
Linear expansion coefficient,10^-6/k0~100℃0~500℃0~100℃0~500℃
10.312.210.512.0
Resistivity(20℃),Ω.mm2/m0.550.52
Longitudinal modulus of elasticity (20℃),kN/mm2200219
MagneticMagneticMagnetic

X20Cr13 | X30Cr13 STEEL FORGING

X20Cr13X30Cr13
Initial Forging Temperature1100℃-1150℃1100℃
Final Forging Temperature850-900℃Min 850℃
Forging Ratio≥4:1≥4:1
Post-Forging TreatmentSlow coolingSlow cooling

X20Cr13 | X30Cr13 STEEL HEAT TREATMENT

  • X20Cr13 | X30Cr13 Annealing
X20Cr13X30Cr13
AnnealingTemperature730-790℃730-790℃
Cooling MethodFurnance CoolingFurnance Cooling
Hardness160-187HB<207HB

X20Cr13 | X30Cr13 Steel Mechanical Properties in Annealed condition

GradeTensile Strength ElongationHardness
X20Cr13
Max 700MpaMin 15%≤225HBW
X30Cr13
Max 740MpaMin 15%≤235HBW
  • X20Cr13 | X30Cr13 Quenching & Tempering(QT)
X20Cr13+QT X30Cr13+QT
Quenching temperature950-1050℃950-1050℃
Cooling Typeoil,airoil,air
Tempering temperature200-350℃200-350℃

What is X20Cr13+QT650 and X20Cr13+QT750?

In fact, QT650 indicates the state of heat treatment, QT is quenching and tempering heat treatment, and 650 indicates that the tensile strength after quenching and tempering reaches more than 650Mpa.
In the same way, QT750 means that the tensile strength after quenching and tempering heat treatment reaches more than 750Mpa.

X20Cr13+QT650 X20Cr13+QT750
Quenching temperature950-1010℃950-1010℃
Cooling Typeoil,airoil,air
Tempering temperature700-780℃620-700℃

Mechanical Properties For QT650 &QT750

GradeTensile Strength 0.2% Proof StrengthElongation
+QT650
650-850Mpa Min 450Min 12%
+QT750750-950Mpa Min 550Min 10%

What is X30Cr13+QT800?

After quenching and tempering heat treatment, the tensile strength of X30Cr13 steel reaches more than 800Mpa, which is QT800

X30Cr13+QT800
Quenching temperature950-1010℃
Cooling Typeoil,air
Tempering temperature650-730℃

Mechanical Properties For QT800

GradeTensile Strength 0.2% Proof StrengthElongation
+QT800
800-1000Mpa Min 600Min 10%

X20Cr13 | X30Cr13 STEEL SUPPLY FORM & SIZE & TOLERANCE

Round bar: Dia 16-200mm As rolled

Round bar: Dia 80-400mm As forged

Surface FinishBlack-Forged Black-Rolled Turned   GrindingPolishedPeeledCold Drawn
Tolerance(0,+5mm)(0,+1mm)(0,+3mm)Best h9Best h11Best H11Best H11

Other shapes for X20Cr13 and X30Cr13 Steel,such as plate,flat,shaft,ring,tube can be customized.

X20Cr13 Forged round steel

X20Cr13 Forged Round Steel in Annealed Condition