ASTM A276 SS 904L Hex Bar

ASTM A276 SS 904L Hex Bar Supplier in China

GNEE's ASTM A276 904L hex bars are manufactured using fully traceable raw materials and undergo 100% PMI (Positive Material Identification) testing to ensure chemical composition compliance with standard requirements: Ni 23.0–28.0%, Mo 4.0–5.0%, Cu 1.0–2.0%, and Cr 19.0–23.0%. Each batch is accompanied by an EN 10204 3.1 Material Test Certificate to guarantee the traceability and authenticity of its chemical composition.

 

 

During the cold drawing process, we strictly control surface quality to ensure that the 904 stainless steel bars feature a smooth finish free of cracks, folds, scale, oxidation marks, or deep scratches. All 904L hex bars undergo solution annealing at temperatures above 1090°C followed by rapid quenching, guaranteeing a yield strength of no less than 220 MPa, a tensile strength of no less than 490 MPa, and an elongation of at least 35%. Controlled hardness levels help reduce tool wear and improve efficiency in cold heading and CNC turning operations.

 

To ensure machining stability and dimensional consistency, the production of 904L hex bars strictly adheres to across-flats (AF) tolerance requirements specified in ASTM A276 and ISO h11/h12 standards. Straightness is controlled within ≤1.5 mm/m, and dimensional deviation is maintained within ±0.10 mm to meet the precision machining demands of fasteners, valve components, and pump parts. Prior to shipment, every bar undergoes hexagonal symmetry and surface integrity inspections.

 

 

For customers operating in highly corrosive environments, we can provide additional corrosion resistance validation, including ASTM A262 Practice E intergranular corrosion testing and third-party laboratory reports. With a PREN (Pitting Resistance Equivalent Number) typically exceeding 35, 904L offers pitting and crevice corrosion resistance significantly superior to conventional 316L stainless steel.

 

904L Stainless Steel Hex Bar Supplier Specification

 

Chemical Composition (Mass Weight %)

Grade	UNS	C (max)	Mn (max)	Si (max)	P (max)	S (max)	Cr	Ni	Mo	Cu
904L	N08904	0.020	2.00	1.00	0.045	0.035	19.0 – 23.0	23.0 – 28.0	4.0 – 5.0	1.0 – 2.0

 

Mechanical Properties (ASTM A276 Standard)

Condition	Tensile Strength (Rm)	Yield Strength (Rp 0.2%)	Elongation (A5)	Hardness (Brinell)	Hardness (Rockwell B)
Annealed	≥ 490 MPa (71 ksi)	≥ 220 MPa (31 ksi)	≥ 35%	≤ 192 HBW	≤ 90 HRB

 

Dimensional Specification & Tolerances (ASTM A484)

Size (Across Flats - S)	Standard Length	Tolerance Class	Surface Finish	Edge Profile
5mm – 100mm (or 3/16" – 4")	3000mm / 6000mm (Customizable)	h11, h12 (Cold Drawn)	Bright, Cold Drawn, Polished	Sharp Corner / Chamfered

 

Stainless Steel 1.4539 Hex Bar Sizes

Type	SIZES (mm)	SIZES (Inches)	ISO Tolerance
Cold Drawn and Polish	3.00 - 75.00	1/8 - 3.00	h8-h9-h10-h11
Cold Drawn and Ground	10.00 - 75.00	5/6 - 2.50	h8-h9-h10-h11
Peeled and Polished	40.00 - 150.00	1.50 - 6.00	h11, h11-DIN 1013
Peeled and Ground	20.00 - 50.00	3/4 - 2.00	h9-h10-h11

 

Tolerance Chart of SS 904L Hex Bar

Over	Inc	H7 J7 K7	H8 J8 K8	H9 J9 K9	H10 J10 K10	H11 J11 K11	H12 J12 K12	H13 J13 K13
1mm	3mm	0.009	0.014	0.025	0.040	0.06	0.09	0.14
3	6	0.012	0.018	0.030	0.048	0.07	0.12	0.18
6	10	0.015	0.022	0.036	0.058	0.09	0.15	0.22
10	18	0.018	0.027	0.043	0.070	0.11	0.18	0.27
18	30	0.021	0.033	0.052	0.084	0.13	0.21	0.33
30	50	0.025	0.039	0.062	0.100	0.16	0.25	0.39
50	80	0.030	0.046	0.074	0.120	0.19	0.30	0.46
80	120	0.035	0.054	0.087	0.140	0.22	0.35	0.54
120	180		0.063	0.100	0.160	0.25	0.40	0.63
180	250				0.185	0.29	0.46	0.72
250	315					0.32	0.52	0.81
315	400					0.36	0.57	0.89
400	500					0.40	0.63	0.97
500						0.44	0.70	1.10

 

ASTM A276 904L Hex Bar vs 316L

When comparing ASTM A276 904L hex bars with 316L stainless steel hex bars, the most significant difference lies in their corrosion resistance. The Pitting Resistance Equivalent Number (PREN) of 904L typically exceeds 35, whereas that of 316L is approximately 23–28. In demanding operating conditions such as seawater desalination, chemical processing, and flue gas desulfurization (FGD) systems, the service life of 904L is often 2 to 3 times longer than that of 316L. Although 904L hex bars generally cost 40% to 80% more than 316L, their lower maintenance frequency, minimized downtime, and extended equipment lifespan can significantly reduce the total lifecycle cost of critical corrosion-resistant components.

 

ASTM A276 904L Hex Bar vs 254 SMO

ASTM A276 904L hex bars and 254 SMO hex bars are both premium corrosion-resistant stainless steels. 254 SMO contains approximately 6.0% molybdenum and 0.18–0.22% nitrogen, yielding a PREN (Pitting Resistance Equivalent Number) value of 42–45, whereas the PREN of 904L is typically above 35. This means that 254 SMO delivers superior resistance to pitting and crevice corrosion in seawater, offshore platforms, and high-salinity process systems.

In most industrial projects, 904L hex bars are generally 20% to 40% cheaper than 254 SMO hex bars. Consequently, when chloride concentrations and operating temperatures remain within moderate design limits, 904L hex bars serve as a highly cost-effective solution.

Applications of 904L Hexagonal Bars

Bolts and nuts for chemical reactors.
Valve components for seawater pumps.
Fasteners for highly corrosive areas in the pulp and paper industry and pharmaceutical plants

ASTM A276 904L Hex Bar Price Per Kg

The price of ASTM A276 Type 904L stainless steel hex bar typically ranges from $2.15 to $4.50 per kilogram ($2,150 to $4,500 per metric ton). The exact price per kg varies based on the specific dimension, finish (e.g., bright, polished, or cold drawn), and order volume.

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 Quality Control

GNEE maintains an in-stock inventory of 80 tons of 904L hexagonal bars. We accommodate both small-batch sample orders (shipped within 3 working days) and large-volume orders (delivered in 7–12 days). All products undergo PMI spectral analysis, as well as tensile, hardness, and intergranular corrosion testing, and are supplied with ASTM A276 material certificates, NACE MR0175 certification, and complete heat/batch traceability reports.

 

High-standard packaging 

For ASTM A276 904L hexagonal bars, we employ export-grade precision packaging: the bars are bundled symmetrically using high-strength steel strapping; the surface is covered with a 0.1mm-thick anti-scratch PE film, and specialized plastic protective caps are fitted to both ends to ensure zero damage to the AF (across-flats) dimensions and edges. The outer packaging consists of ISPM 15-compliant fumigated wooden crates, and a 3.1 material certificate corresponding to the specific Heat No. is included with the shipment.