A194 Grade 8R S20910 - ASTM A194/A194M-2026

Grade	A194 Grade 8R
USA UNS	S20910
AISI American Iron and Steel Institute	XM19
Corresponding Standard	ASTM A194/A194M-2026 Standard Specification for Carbon Steel, Alloy Steel, and Stainless Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both
Classification	Austenitic Stainless Steel
Properties	Corrosion Resistance

A194 Grade 8R Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Mo	N	V	Nb
Minimum Value	-	-	4	-	-	20.5	11.5	1.5	0.2	0.1	0.1
Maximum Value	0.06	1	6	0.045	0.03	23.5	13.5	3	0.4	0.3	0.3

* Do not intentionally include bismuth (Bi), selenium (Se), antimony (Sb), or lead (Pb).
* Because of the degree to which sulfur segregates, product analysis for sulfur over 0.060 % max is not technologically appropriate.

A194 Grade 8R Mechanical Properties

product	Hardness HBW
Finished Nuts	182~271HBW ≤25HRC ≥88HRB

A194Grade8R Corresponding Standards(Same grade name, different standards)

1	ASTM A194/194M-2016
	A194 Grade 8R S20910 XM19
2	ASTM A194/A194M-2020
	A194 Grade 8R S20910 XM19
3	ASTM A194/A194M-2023
	A194 Grade 8R S20910 XM19
4	ASTM A194/A194M-2026
	A194 Grade 8R S20910 XM19

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!