High manganese carbon steel (Lean alloy steel)

- Nov 30, 2021-

Introduce

Lean alloy steel refers to the alloy steel with a total amount of alloying elements less than 5%. Lean alloy steel is relative to carbon steel, as well as based on it. In order to improve the performance of steel, people intentionally add one or several alloying elements to the steel. When the amount of alloy added exceeds the general content of the normal production method of carbon steel, the steel is called alloy steel. When the total amount is less than 5%, it’s called Lean alloy steel, ordinary alloy steel is generally less than 3.5%, and the alloy content is between 5-10% is called Key in alloy steel, and those with more than 10% are called High alloy steel.


Application and characteristics  

The parts of lean alloy steel structure usually need to go through processes such as forming-welding-post welding heat treatment, which requires the steel to have good process performance. Process performance includes metal weldability, cutting performance, cold and hot workability, heat treatment performance, forgeability, uniform structure stability and large section hardenability. While considering the material cost, the impact of material processing and welding difficulty on the manufacturing cost should also be considered.

Lean alloy steel has been widely used in the manufacture of construction machinery, ships, bridges, high-rise buildings, boilers and pressure vessels, electric power and various vehicles. This is inseparable from its characteristics. (such as: plasticity, toughness, welding performance )   


Lean alloy steel properties

Strength

The yield point of the steel structure determines the stress that the structure can withstand without permanent deformation. The minimum yield point of typical carbon structural steel is 235Mpa. The minimum yield point of typical lean alloy high strength steel is 345Mpa. Therefore, according to the proportional relationship of its yield point, the use of lean alloy high strength steel allows the stress to be 1.4 times higher than that of carbon structural steel.

 

Formability  

In order to easily and economically perform hot or cold processing to make various parts of engineering structures, lean alloy high strength steel must have appropriate forming properties. The same as carbon structural steels, lean alloy high strength steels can generally be processed such as shearing, punching and machining. Although its yield point is high, cold bending presses, drawing machines, presses and other equipment used for carbon structural steel forming can be used even if the deformation of the forming operation is quite severe, but some equipment needs to be modified.

 

Welding performance     

Due to the steel structure is often used in the production process of welding technology, it’s very important for lean alloy high strength steels of this type to be welded by arc welding processes that are widely used in the thickness of thin plates and steel strips. It’s also very important that the welded seam of the steel structure produced should have the required strength and toughness, so as to withstand the most unfavorable conditions for the intended use.  

 

Corrosion resistance    

When using lean alloy high strength steel, it’s desirable to take advantage of its high strength and use a thinner section. This is not only to save weight but also to be as economical as possible. However, the factor of corrosion must be fully considered. The thinner the steel section, the more attention should be paid to corrosion. The anti-corrosion of any steel structure is generally achieved by applying an anti-corrosion layer on a properly prepared surface and protecting the anti corrosion layer.

 

Notch toughness

Lean alloy high strength steel types are designed to have fairly good notch toughness for their intended structural use. The applicability of the notch toughness of specific types of lean alloy high strength steel is either based on existing use experience or combined with the impact test results of notched specimens. In order to meet the extremely stringent requirements of certain application, some lean alloy high strength steels produced have excellent notch toughness. For example, controlled hot rolling technology is usually used to produce lean alloy high strength steel plates for the manufacture of welded pipeline steel pipes. Such steel pipes need to meet the requirements of relevant standards for notch toughness.


High manganese carbon steel (Lean alloy steel)



Chemical Composition 
SAEAISIUNS
    Digital
    System
CSiMnP,≤S, ≤
13301330G133000.28~0.330.15~0.351.60~1.900.0350.040
1330H1330HH133000.27~0.330.15~0.351.45~2.050.0350.040
13351335G133500.33~0.380.15~0.351.60~1.900.0350.040
1335H1335HH133500.32~0.380.15~0.351.45~2.050.0350.040
13401340G134000.38~0.430.15~0.351.60~1.900.0350.040
1340H1340HH134000.37~0.440.15~0.351.45~2.050.0350.040
13451345G134500.43~0.480.15~0.351.60~1.900.0350.040
1345H1345HH134500.42~0.490.15~0.351.45~2.050.0350.040
15131513G151300.10~0.16a,b,c,d,e1.10~1.400.0400.050
15181518G151800.15~0.21a,b,c,d,e1.10~1.400.0400.050
15B21H15B21HH152110.17~0.240.15~0.350.70~1.200.0400.050
15221522G152200.18~0.24b,c,d,e1.10~1.400.0400.050
1522H1522HH152200.17~0.250.15~0.351.00~1.500.0400.050
15241524G152400.19~0.25b,c,d,e1.35~1.650.0400.050
1524H1524HH152400.18~0.260.15~0.351.25~1.750.0400.050
15251525G152500.23~0.29b,c,d,e0.80~1.100.0400.050
15261526G152600.22~0.29b,c,d,e1.10~1.400.0400.050
1526H1526HH152600.21~0.300.15~0.351.00~1.500.0400.050
15271527G152700.22~0.29b,c,d,e1.20~1.500.0400.050
15B35H15B35HH153510.31~0.390.15~0.350.70~1.200.0400.050
15361536G153600.30~0.37b,c,d,e1.20~1.500.0400.050
15B37H15B37HH153710.30~0.390.15~0.351.00~1.500.0400.050
15411541G154100.36~0.44b,c,d,e1.35~1.650.0400.050
1541H1541HH154100.35~0.450.15~0.351.25~1.750.0400.050
15B41H15B41HH154110.35~0.450.15~0.351.25~1.750.0400.050
15471547G154700.43~0.51b,c,d,e1.35~1.650.0400.050
15481548G154800.44~0.52b,c,d,e1.10~1.400.0400.050
15B48H15B48HH154810.43~0.530.15~0.351.00~1.500.0400.050
15511551G155100.45~0.56b,c,d,e0.85~1.150.0400.050
15521552G155200.47~0.55b,c,d,e1.20~1.500.0400.050
15611561G156100.55~0.65b,c,d,e0.75~1.050.0400.050
15B62H15B62HH156210.54~0.670.40~0.601.00~1.500.0400.050
15661566G156600.60~0.71b,c,d,e0.85~1.150.0400.050
15721572G157200.65~0.76b,c,d,e1.00~1.300.0400.050

 Note: a≤0.10%, b=0.10%~0.20%, c=0.15%~0.30%, d=0.20%~0.40%, e=0.30%~0.60%

Mechanical   Properties
UNS
    Digital
    System
ASTM
    Standard
    Number
SIZE
    /mm
StateT.S.
    /Mpa
Y.S.
    /Mpa
EL/%
    (L0=50mm)
Hardness
    HBS
G13300-Φ25.4WQ+T(204℃,400℉)
WQ+T(316℃,600℉)
WQ+T(427℃,800℉)
WQ+T(538℃,1000℉)
WQ+T(649℃,1200℉)
1600
1427
1158
876
731
1455
1282
1034
772
572
9
9
15
18
23
459
402
335
263
216
G13400-Φ25.4Normalizing(802℃,1475℉)
    Annealing(871℃,1600℉)
    OQ+T(204℃,400℉)
    OQ+T(316℃,600℉)
    OQ+T(427℃,800℉)
    OQ+T(538℃,1000℉)
    OQ+T(649℃,1200℉)
703
834
1806
1586
1262
965
800

434

558

1593
1420
1151
827
621
25.5
22
11
12

14

17

22
207
248
505
453
375
295
252

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