please explain for me the material's name. S690/WTP80C?

Answer 1

S690/WTP80C:

S690 is a reference to a high-strength steel.
WTP80C is a chemical composition for a Chinese-produced "equivalent" steel, would be my guess.

Composition of WTP80C (quantities are in percent):
Carbon < 0.18
Silicon 0.15-0.35
Manganese 0.6 - 1.20
Phosphorus < 0.30
Sulfur < 0.030
Copper 0.15 - 0.50
Chromium 0.70 - 1.3
Molybdenum < 0.60
Boron < 0.006
Nickel ... unlisted

Answer 2

High Performance SMT ChipLED -- HSMA-S690 Light Emitting Diodes (LED).
(High Performance SMT ChipLED -- HSMA-S690
SPECIFICATIONS View Entire Datasheet :
Forward Current (milliamps) 30.00
Forward Voltage (volts) 1.90
Lens Type Domed Lens
LED Package:
1.6mm x 0.8mm x 0.7mm
Notes :
High brightness AlInGaP material, app: keypad, LED and symbol backlighting
WTP80C:
Be more specific or use more keywords (e.g. pyrometer calibration).
Enter a document name or number (e.g. STD2555).
Select a single standards organization (e.g. ASTM).