• STR21 round bar
  • STR21 forging
  • STR21 sheet
  • STR21 flat bar
  • STR21 pipe


LonghaiSteel supply domestic and overseas customers with STR21 steel plate, STR21 flat steel,STR21 steel sheet,STR21 wire coil,STR21 square bar,STR21 round rod, STR21 steel pipe,STR21forged valve body,STR21 forged steel rings,STR21 forged multidiameter shafts. Through many years' production experiences,we strictly control STR21 chemical composition and mechanical properties from casting, forging, rolling, heat treatment, etc. We have advanced precision machining equipments with a higher productioncapacity,bringinga best service and affordable prices to customersfrom all over the world.

LonghaiSteel are Manufacturer and supplier of STR21 heat resistant steel plate,sheet material with high quality and affordable quotation, If you are keen interested in the heat resistant steel plate, please feel free to contact with us for more detailed data concerning this type of Special alloy Today! We will serve you with our honesty, integrity, and professionality. And specific features are as follows:

Steel grade & Chemical composition - Heat resistant steel plate
Steel grade:  STR21
Category:    Ferrite

C(%):    ≤0.10
Si(%):    ≤1.50
Mn(%):    ≤1.00
P(%)≤:    0.04
S(%)≤:    0.03
Cr(%):    17.O~21.0
Ni(%)①:    (≤0.60)
Mo(%):    —
N(%):    —
Other(%):    Al2.00~4.00

Mechanical property of annealing condition  - Heat resistant steel round bar and plate
Steel grade:    STR21
Tensile test|yield strength ≥/MPa:        245
Tensile test|tensile strength ≥/MPa:  440
Tensile test|elongation ≥(%):    15
Tensile test|reduction of area≥(%):   -
Hardness HBS:    210


Heat treatment regime - Heat resistant steel bar and plate                
Category:  Ferrite
Steel grade:  STR21

Heat treatment temperature (℃) and cooling method|annealing:   780~950 rapid / slow cooling
Heat treatment temperature (℃) and cooling method|solution treatment or quenching:  -
Heat treatment temperature (℃) and cooling method|ageing treatment or tempering :    -

Heat resistant steels hold main features, such as oxidative stability, enough high temperature strength, excellent heat resistant quality under hight temperature. Heat resistant steel divides into oxidation resistant  steel (or called non-scaling steel) and refractory steel according to its performance. Heat resistant steel also divides into austenitic heat resistance steel, martensitic heat resistant steel, ferritic heat resistant steel and pearlite heat resistant steel according to normalizing structure.

Application field:

Heat resistant steels are widely used in the field of processing boiler, steam turbine, industrial furnace, and other mechanical parts of aviation, petrochemical engineering operating at high temperature. Those parts must hold the features: high temperature strength,resistance to high temperature oxide etch,enough toughness,excellent machinability, weldability, structure stability based on different usages.

Manufacturing technology - Smelting
Heat resistant steel is generally smelt in electric arc furnace or induction furnace.
For higher quality,it should be smelt via technology of vacuum refining and external refining.
These materials must stand up to high heat, extreme oxidation potential and cycling
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LonghaiSteel have advanced production equipment and a team of professional design team, strict implementation of ISO9001 quality management system
Specialized in high quality steel and best service
Forged/hot rolling/ extrusion of steel
We produce and offer steel products with following specifications:
Round bar steel (Diameter): 1mm to 3000mm
Square steel: 1mm to 2000mm
Plate steel: 0.1mm to 2500mm
Width: 10mm to 2500mm
Length: We can supply random length based on the customer's requirement.
Forged steel shape: Shafts with flanks/pipes/tubes/slugs/donuts/cubes/other shapes
Tubings: OD: φ6-219 mm, with wall thickness ranging from 1-35 mm.

Finished goods condition: hot forging/hot rolling + annealing/normalizing + tempering/quenching + tempering/any other conditions based on the customer's requirement
Surface conditions: scaled (hot working finished)/ground/rough machining/fine machining or based on the customer's special requirements.
Furnaces for metallurgical processing: electrode arc + LF/VD/VOD/ESR/Vacuum consumable electrode.
Ultrasonic inspection: 100% ultrasonic inspection for any inperfection or based on the customer's requirement. Excellent service for all kinds of industries,with advantages of technologies, equipment and price.

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