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Definitely not stainless - it's similar to 4130 CroMo but doesn't require post-welding heat treatment which technically 4130 should have, albeit quite often doesn't get in bike frame construction. T45 is similar to non-heat-treated 4130, so equivalent broadly to 525/531 Reynolds stuff in terms of ultimate tensile strength. If you used 4130 and heat-treated it after construction it would be superior (slightly) to T45, but ain't no-one got time for that.
Brommers
T45 is stainless I thought.
Not sure the same kind of alloy as Reynolds 953/931