SAE J770
SAE J770 properties and heat treatment forged piece, Including SAE J770 application and specifications, We have all specifications，Including SAE J770 steel plate, SAE J770 sheet, SAE J770 square steel, SAE J770 flat bar,SAE J770 round bar,SAE J770 forgings, we can own production and sales.
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We can produce the SAE J770 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 SAE J770 and Standards
AISI 50B40 steel
Categories: Metal; Ferrous Metal; Alloy Steel; AISI 5000 Series steel; Low Alloy Steel; Carbon Steel; Medium Carbon steel
Key Words: UNI 38 CrB 1 KB (Ital.), medium carbon steels, UNS G50401, ASTM A322, ASTM A519, SAE J404, SAE J412, SAE J770, DIN 1.7007
| Physical Properties | Metric | English | Comments |
|---|---|---|---|
| Density | 7.85 g/cc | 0.284 lb/in³ | |
| Mechanical Properties | Metric | English | Comments |
| Hardness, Brinell | 174 - 223 | 174 - 223 | annealed and cold drawn. |
| Hardness, Knoop | 221 | 221 | Converted from Brinell hardness. |
| Hardness, Rockwell B | 92 | 92 | Converted from Brinell hardness. |
| Hardness, Rockwell C | 13.0 | 13.0 | Converted from Brinell hardness. Value below normal HRC range, for comparison purposes only. |
| Hardness, Vickers | 208 | 208 | Converted from Brinell hardness. |
| Modulus of Elasticity | 205 GPa | 29700 ksi | Typical for steel |
| Bulk Modulus | 140 GPa | 20300 ksi | Typical for steel. |
| Poissons Ratio | 0.290 | 0.290 | Calculated |
| Machinability | 65 % | 65 % | annealed and cold drawn. Based on 100% machinability for AISI 1212 steel. |
| Shear Modulus | 80.0 GPa | 11600 ksi | Typical for steels. |
| Electrical Properties | Metric | English | Comments |
| Electrical Resistivity | 0.0000219 ohm-cm | 0.0000219 ohm-cm | Typical 5000 series steel |
| Thermal Properties | Metric | English | Comments |
| Specific Heat Capacity | 0.475 J/g-°C | 0.114 BTU/lb-°F | Typical 4000 series steel |
| Thermal Conductivity | 46.6 W/m-K | 323 BTU-in/hr-ft²-°F | Typical steel |
| Component Elements Properties | Metric | English | Comments |
| Boron, B | 0.000500 - 0.00300 % | 0.000500 - 0.00300 % | |
| Carbon, C | 0.380 - 0.430 % | 0.380 - 0.430 % | |
| Chromium, Cr | 0.400 - 0.600 % | 0.400 - 0.600 % | |
| Iron, Fe | 97.592 - 98.3195 % | 97.592 - 98.3195 % | As remainder |
| Manganese, Mn | 0.750 - 1.00 % | 0.750 - 1.00 % | |
| Phosphorous, P | <= 0.0350 % | <= 0.0350 % | |
| Silicon, Si | 0.150 - 0.300 % | 0.150 - 0.300 % | |
| Sulfur, S | <= 0.0400 % | <= 0.0400 % | |
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Machining performance
Download SAE J770 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.