NL25 KK first hand is this push terrible?

[Arouet]

1st hand, no reads: but table had high avg $ value.

Party Poker
No Limit Holdem Ring game
Blinds: $0.10/$0.25
6 players
Converter

Stack sizes:
UTG: $5
UTG+1: $25.23
CO: $63.66
Button: $38.45
SB: $26.13
Hero: $25

Pre-flop: (6 players) Hero is BB with K[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/club.gif[/img]
UTG (poster) checks, UTG+1 calls, CO calls, Button calls, SB calls, <font color="#cc0000">Hero raises to $1.75</font>, 3 folds, Button calls, SB calls.

Flop: 3[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] ($6, 3 players)
SB checks, <font color="#cc0000">Hero bets $4.5</font>, Button calls, SB calls.

Turn: 7[img]/images/graemlins/heart.gif[/img] ($19.5, 3 players)
SB checks, <font color="#cc0000">Hero is all-in $18.75</font>,