<SEC-DOCUMENT>0001193125-21-102058-index.html : 20210331
<SEC-HEADER>0001193125-21-102058.hdr.sgml : 20210331
<ACCEPTANCE-DATETIME>20210331144022
ACCESSION NUMBER:		0001193125-21-102058
CONFORMED SUBMISSION TYPE:	S-3ASR
PUBLIC DOCUMENT COUNT:		7
FILED AS OF DATE:		20210331
DATE AS OF CHANGE:		20210331
EFFECTIVENESS DATE:		20210331

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ALLEGHENY TECHNOLOGIES INC
		CENTRAL INDEX KEY:			0001018963
		STANDARD INDUSTRIAL CLASSIFICATION:	STEEL PIPE & TUBES [3317]
		IRS NUMBER:				251792394
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		S-3ASR
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-254906
		FILM NUMBER:		21792589

	BUSINESS ADDRESS:	
		STREET 1:		1000 SIX PPG PLACE
		CITY:			PITTSBURGH
		STATE:			PA
		ZIP:			15222
		BUSINESS PHONE:		4123942800

	MAIL ADDRESS:	
		STREET 1:		100 SIX PPG PLACE
		CITY:			PITTSBURGH
		STATE:			PA
		ZIP:			15222

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ALLEGHENY TELEDYNE INC
		DATE OF NAME CHANGE:	19960716
</SEC-HEADER>
<DOCUMENT>
<TYPE>S-3ASR
<SEQUENCE>1
<FILENAME>d104541ds3asr.htm
<DESCRIPTION>S-3ASR
<TEXT>
Document 1 - file: d104541ds3asr.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-4.10
<SEQUENCE>2
<FILENAME>d104541dex410.htm
<DESCRIPTION>EX-4.10
<TEXT>
Document 2 - file: d104541dex410.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-4.12
<SEQUENCE>3
<FILENAME>d104541dex412.htm
<DESCRIPTION>EX-4.12
<TEXT>
Document 3 - file: d104541dex412.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>4
<FILENAME>d104541dex51.htm
<DESCRIPTION>EX-5.1
<TEXT>
Document 4 - file: d104541dex51.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>5
<FILENAME>d104541dex231.htm
<DESCRIPTION>EX-23.1
<TEXT>
Document 5 - file: d104541dex231.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>g104541dsp152.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: g104541dsp152.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>g104541g18n73.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: g104541g18n73.jpg

</DOCUMENT>
</SEC-DOCUMENT>