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Solid solution steels

Description

Solid solution steels are designed to provide high strength while maintaining good drawability. These steels are hardened by phosphorous in solid solution in the ferrite.
Their combination of mechanical strength and drawability makes these grades suitable for numerous applications. They are particularly recommended for structural and reinforcement parts requiring good fatigue and impact strength (longitudinal beams, cross members, B-pillars, etc.).
Solid solution steels are killed aluminum grades with lower drawing quality than the IF range of steels.

The ArcelorMittal range of continuous hot dip galvanized (Extragal®/Galvannealed) steels is described under interstitial-free steels.

Applications

Longitudinal beam in H 260
(thickness: 1.8 mm)

Cross members in H 260

Designation and standard

  Euronorms VDA 239-100
H 220 HC220P (+ZE)
H 260 HC260P (+ZE)
H 300 HC300P (+ZE)
 

Euronorms
Uncoated ( EN 10268: 2006+A1: 2013): Steel grade name
Electrogalvanized (EN 10268 :2006+A1: 2013 + EN 10152 :2017): Steel grade name+ZE

VDA 239-100

 
 Hot rolled     Cold rolled

While the ArcelorMittal grades conform perfectly well to the indicated EN standards, ArcelorMittal grades generally offer tighter mechanical properties (see table below).

The above indicative table summarizes the European and VDA standards corresponding to the ArcelorMittal product range.

Technical characteristics

Mechanical properties
Guaranteed for ISO 20x80 specimen of uncoated sheet in the transverse direction

  YS (MPa) UTS (MPa) ef (%)
L0 = 80 mm
th < 3 mm
r n
 H 220 220 - 280 340 - 400 ≥ 32 ≥ 1,3 ≥ 0,16
 H 260 260 - 320 380 - 440 ≥ 29
 H 300 300 - 360 400 - 480 ≥ 26
 
 Hot rolled     Cold rolled

Chemical composition (%)

  C Mn Si
  Max Max Max
H 220 0,060 0,70 0,50
H 260 0,080 0,70 0,50
H 300 0,100 0,70 0,50
 
 Hot rolled     Cold rolled

Available coatings and Worldwide availability

  Uncoated Electrogalvanized
  EUR NAM SAM RSA CHI EUR NAM SAM RSA CHI
H 220        
H 260            
H 300            

 Hot rolled     Cold rolled

Available in non-visible part quality Undergoing customer testing Under development Available in visible and non-visible part quality (Z)

EUR : Europe Region - NAM : North America Region - SAM : South America Region - RSA : South Africa Region - CHI : China

X available - XX available in visible part quality

Microstructure of grade H 260

Recommendations for use and secondary processing

Forming
ArcelorMittal has an extensive database on the forming of solid solution steels. To integrate these steels at the design stage, a team of experts is available to carry out specific studies based on modeling or shop-floor experience.

The diagram opposite shows examples of forming limit curves for the solid solution family of steels in 1.0 mm thickness.

Forming limit curves for solid solution steels

(thickness: 1.0 mm)

Welding

Solid solution steels can be readily welded by all welding processes.

ArcelorMittal can provide technical assistance in adjusting the welding parameters of any other product in the solid solution range, and can advise on the arc and laser weldability of these of steels.

Fatigue strength

Fatigue strength can be expressed as an endurance limit (maximum stress).

Examples of Wöhler curves for a variety of Solid solution steels are given in the graph below. The curves plot maximum stress versus number of cycles to failure. They are calculated for a tension-compression loading ratio of R = 0.1.

Wöhler curves for a variety of Solid solution steels

ArcelorMittal can provide full data relating to the fatigue performance of Solid solution steels.

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