STPA25
STPA25 properties and heat treatment forged piece, Including STPA25 application and specifications, We have all specifications，Including STPA25 steel plate, STPA25 sheet, STPA25 square steel, STPA25 flat bar,STPA25 round bar,STPA25 forgings, we can own production and sales.
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We can produce the STPA25 has the following specifications:
Round bar steel: 1mm to 3000mm
Square-shape steel: 1mm to 2000mm
Plate steel:0.1mm to 2500mm
Width: 10mm to 2500mm
Lenth: We can supply any lenth based on the customer's requirement.
Forging: 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 conditions based on the customer's requirement
Surface conditions: scaled (hot working finish)/ground/rough machining/fine machining/based on the customer's requirement
Furnaces for metallurgical processing: electrode arc + LF/VD/VOD/ESR/Vacuum consumable electrode.
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Chemical composition % of the ladle analysis of grade STPA25 and Standards
Characteristics for grade 15KH5M ( 15Х5М ).
| Grade : | 15KH5M ( 15Х5М ) ( Х5М ) |
| Classification : | Low alloy high-temperature steel |
| C | Si | Mn | Ni | S | P | Cr | Mo | W | V | Ti | Cu |
| max 0.15 | max 0.5 | max 0.5 | max 0.6 | max 0.025 | max 0.03 | 4.5 - 6 | 0.45 - 0.6 | max 0.3 | max 0.05 | max 0.03 | max 0.2 |
Ac1 = 815 , Ac3(Acm) = 848 , Ar3(Arcm) = 775 , Ar1 = 718
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Bar | Ø 90 | 390 | 215 | 22 | 50 | 1180 | Annealing 840 - 860oC,Cooling oven, | |
| Sheet trick, GOST 7350-77 | 470 | 235 | 18 | Annealing 840 - 870oC,Cooling air, | ||||
| Pipe hot strain, GOST 550-75 | 392 | 216 | 22 | 50 | 1180 |
| Brinell hardness for grade 15KH5M ( 15Х5М ) (hot-rolled, annealing) , GOST 20072 | HB 10 -1= 217 MPa |
| Brinell hardness for grade 15KH5M ( 15Х5М ) , Pipe GOST 550-75 | HB 10 -1= 170 MPa |
Physical properties for grade 15KH5M ( 15Х5М )
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
| Grade | MPa | 1/Grade | Watt/(m·Grade) | kg/m3 | J/(kg·Grade) | Ohm·m |
| 20 | 2.11 | 7750 | 430 | |||
| 100 | 11.3 | 37 | 7730 | 483 | ||
| 200 | 11.6 | 36 | 7700 | |||
| 300 | 11.9 | 35 | 7670 | |||
| 400 | 1.78 | 12.2 | 34 | 7640 | ||
| 500 | 1.45 | 12.3 | 33 | 7610 | ||
| 600 | 1.02 | 12.5 | 7580 | |||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Technological properties for grade 15KH5M ( 15Х5М )
| Weldability: | hard weldability. |
| Flakes : | predisposed |
| Temper brittleness: | not predisposed |
Equivalent steels for grade 15KH5M ( 15Х5М )
| USA | Germany | Japan | France | European | Italy | China | Hungary | Poland | Romania | Czechia | |||||||||||||||||||||||||||||
| - | DIN,WNr | JIS | AFNOR | EN | UNI | GB | MSZ | PN | STAS | CSN | |||||||||||||||||||||||||||||
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Specification :
| Mechanical properties : | |
| sв | - Tensile strength , [MPa] |
| sT | - Yield stress, [MPa] |
| d5 | - Specific elongation at fracture , [ % ] |
| y | - Reduction of area , [ % ] |
| KCU | - Impact strength , [ kJ / m2] |
| HB | - Brinell hardness , [MPa] |
Physical properties : |
|
| T | - Test temperature , [Grade] |
| E | - Young modulus , [MPa] |
| a | - Coefficient of linear expansion (range 20o - T ) , [1/Grade] |
| l | - Termal (heat) condition coefficient , [Watt/(m·Grade)] |
| r | - Density , [kg/m3] |
| C | - Specific heat ( range 20o - T ), [J/(kg·Grade)] |
| R | - Electrical resistance , [Ohm·m] |
Weldability : |
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| without limitations | - welding is done without heating and subsequent heat treeting |
| limited weldability | - welding is possible under heating up to 100-120 grade and subsequent heat treeting |
| hard weldability | - obtaining the quality welding needs the additional operations:heating up to 200-300 grade; the heat treeting ia annealing |
Machining performance
Download STPA25 the mechanical properties of the report, the report provides detailed performance analysis and application. Download >>
Principal Design Features
One of the most widely used precipitation hardening grades in the business. While soft and ductile in the solution annealed condition, it is capable of high properties with a single precipitation or aging treatment. Characterized by good corrosion resistance, high harness, toughness and strength.
Machinability
Long, gummy chips characterize this alloys machinability. It can be machined in the annealed condition, however condition H1150M will yield best results. Post machining solution treatment of parts will be required prior to final hardening if machining in this condition.
Heat Treatment
CONDITION A--Soak at 1900 F (1038 C) for 30 minutes and cool below 60 F (16 C) for complete martensite transformation. CONDITION H 950- Treat Condition A material at 900 F(482 C) for 1 hour, air cool.. CONDITION H925, H1025, H1075, H1100, H1150- Soak solution treated material for 4 hours at specified temperature, air cool, CONDITION H1150M- Soak solution treated material at 1400 F (760 C) for 2 hours, air cool, then re-heat to 1150 F (620 C) for 4 hours and air cool.
Welding
Successfully welded by common fusion and resistance methods, this alloy should not be joined by oxyacetylene welding. AWS E/ER630 filler metal is recommended if required.
Forging
Soak for 1 hour at 2150 F (1177 C) prior to forging. Do not work below 1850 F (1010 C). Post-work solution treatment is required prior to final hardening.